a897d0e tests: Remove OldSetKeyFromPassphrase/OldEncrypt/OldDecrypt (practicalswift)
Pull request description:
Reduces the number of non-free:d allocs with four (Δ in use at exit = -928 bytes).
With this patch applied:
```
$ valgrind --leak-check=full --show-leak-kinds=all src/test/test_bitcoin --log_level=test_suite --run_test=wallet_crypto
…
==20243== HEAP SUMMARY:
==20243== in use at exit: 72,704 bytes in 1 blocks
==20243== total heap usage: 53,138 allocs, 53,137 frees, 49,600,420 bytes allocated
==20243==
==20243== 72,704 bytes in 1 blocks are still reachable in loss record 1 of 1
==20243== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==20243== by 0x6AA5EFF: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==20243== by 0x40106B9: call_init.part.0 (dl-init.c:72)
==20243== by 0x40107CA: call_init (dl-init.c:30)
==20243== by 0x40107CA: _dl_init (dl-init.c:120)
==20243== by 0x4000C69: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so)
==20243== by 0x2: ???
==20243== by 0xFFF0006A2: ???
==20243== by 0xFFF0006B8: ???
==20243== by 0xFFF0006CF: ???
==20243==
==20243== LEAK SUMMARY:
==20243== definitely lost: 0 bytes in 0 blocks
==20243== indirectly lost: 0 bytes in 0 blocks
==20243== possibly lost: 0 bytes in 0 blocks
==20243== still reachable: 72,704 bytes in 1 blocks
==20243== suppressed: 0 bytes in 0 blocks
```
Without this patch applied:
```
$ valgrind --leak-check=full --show-leak-kinds=all src/test/test_bitcoin --log_level=test_suite --run_test=wallet_crypto
…
==19023== HEAP SUMMARY:
==19023== in use at exit: 73,632 bytes in 5 blocks
==19023== total heap usage: 52,718 allocs, 52,713 frees, 49,502,962 bytes allocated
==19023==
==19023== 24 bytes in 1 blocks are still reachable in loss record 1 of 5
==19023== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==19023== by 0x642DE77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E5665: lh_insert (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E7BB3: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E87AD: ERR_get_state (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E883D: ERR_put_error (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64EAAE4: EVP_DecryptFinal_ex (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x3AD150: wallet_crypto::OldDecrypt(std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, secure_allocator<unsigned char> >&, unsigned char const*, unsigned char const*) (crypto_tests.cpp:81)
==19023== by 0x3AF892: wallet_crypto::TestCrypter::TestDecrypt(CCrypter const&, std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, std::allocator<unsigned char> > const&) (crypto_tests.cpp:137)
==19023== by 0x3AD5E9: wallet_crypto::decrypt::test_method() (crypto_tests.cpp:223)
==19023== by 0x3ADC11: wallet_crypto::decrypt_invoker() (crypto_tests.cpp:216)
==19023== by 0x182596: invoke<void (*)()> (callback.hpp:56)
==19023== by 0x182596: boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused, void (*)()>::invoke() (callback.hpp:89)
==19023==
==19023== 128 bytes in 1 blocks are still reachable in loss record 2 of 5
==19023== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==19023== by 0x642DE77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E5331: lh_new (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E7862: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E7B7F: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E87AD: ERR_get_state (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E883D: ERR_put_error (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64EAAE4: EVP_DecryptFinal_ex (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x3AD150: wallet_crypto::OldDecrypt(std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, secure_allocator<unsigned char> >&, unsigned char const*, unsigned char const*) (crypto_tests.cpp:81)
==19023== by 0x3AF892: wallet_crypto::TestCrypter::TestDecrypt(CCrypter const&, std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, std::allocator<unsigned char> > const&) (crypto_tests.cpp:137)
==19023== by 0x3AD5E9: wallet_crypto::decrypt::test_method() (crypto_tests.cpp:223)
==19023== by 0x3ADC11: wallet_crypto::decrypt_invoker() (crypto_tests.cpp:216)
==19023==
==19023== 176 bytes in 1 blocks are still reachable in loss record 3 of 5
==19023== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==19023== by 0x642DE77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E530F: lh_new (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E7862: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E7B7F: ??? (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E87AD: ERR_get_state (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E883D: ERR_put_error (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64EAAE4: EVP_DecryptFinal_ex (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x3AD150: wallet_crypto::OldDecrypt(std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, secure_allocator<unsigned char> >&, unsigned char const*, unsigned char const*) (crypto_tests.cpp:81)
==19023== by 0x3AF892: wallet_crypto::TestCrypter::TestDecrypt(CCrypter const&, std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, std::allocator<unsigned char> > const&) (crypto_tests.cpp:137)
==19023== by 0x3AD5E9: wallet_crypto::decrypt::test_method() (crypto_tests.cpp:223)
==19023== by 0x3ADC11: wallet_crypto::decrypt_invoker() (crypto_tests.cpp:216)
==19023==
==19023== 600 bytes in 1 blocks are still reachable in loss record 4 of 5
==19023== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==19023== by 0x642DE77: CRYPTO_malloc (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E8745: ERR_get_state (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64E883D: ERR_put_error (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x64EAAE4: EVP_DecryptFinal_ex (in /lib/x86_64-linux-gnu/libcrypto.so.1.0.0)
==19023== by 0x3AD150: wallet_crypto::OldDecrypt(std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, secure_allocator<unsigned char> >&, unsigned char const*, unsigned char const*) (crypto_tests.cpp:81)
==19023== by 0x3AF892: wallet_crypto::TestCrypter::TestDecrypt(CCrypter const&, std::vector<unsigned char, std::allocator<unsigned char> > const&, std::vector<unsigned char, std::allocator<unsigned char> > const&) (crypto_tests.cpp:137)
==19023== by 0x3AD5E9: wallet_crypto::decrypt::test_method() (crypto_tests.cpp:223)
==19023== by 0x3ADC11: wallet_crypto::decrypt_invoker() (crypto_tests.cpp:216)
==19023== by 0x182596: invoke<void (*)()> (callback.hpp:56)
==19023== by 0x182596: boost::unit_test::ut_detail::callback0_impl_t<boost::unit_test::ut_detail::unused, void (*)()>::invoke() (callback.hpp:89)
==19023== by 0x596CCB0: ??? (in /usr/lib/x86_64-linux-gnu/libboost_unit_test_framework.so.1.58.0)
==19023== by 0x594C995: boost::execution_monitor::catch_signals(boost::unit_test::callback0<int> const&) (in /usr/lib/x86_64-linux-gnu/libboost_unit_test_framework.so.1.58.0)
==19023==
==19023== 72,704 bytes in 1 blocks are still reachable in loss record 5 of 5
==19023== at 0x4C2DB8F: malloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==19023== by 0x6AA5EFF: ??? (in /usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.21)
==19023== by 0x40106B9: call_init.part.0 (dl-init.c:72)
==19023== by 0x40107CA: call_init (dl-init.c:30)
==19023== by 0x40107CA: _dl_init (dl-init.c:120)
==19023== by 0x4000C69: ??? (in /lib/x86_64-linux-gnu/ld-2.23.so)
==19023== by 0x2: ???
==19023== by 0xFFF0006A2: ???
==19023== by 0xFFF0006B8: ???
==19023== by 0xFFF0006CF: ???
==19023==
==19023== LEAK SUMMARY:
==19023== definitely lost: 0 bytes in 0 blocks
==19023== indirectly lost: 0 bytes in 0 blocks
==19023== possibly lost: 0 bytes in 0 blocks
==19023== still reachable: 73,632 bytes in 5 blocks
==19023== suppressed: 0 bytes in 0 blocks
==19023==
==19023== For counts of detected and suppressed errors, rerun with: -v
==19023== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
```
Tree-SHA512: 38b6552736a5710a42dbad770c490583cfc762acbec716f5db4cf38314f494ea99430713ea407c73b49d867676ced221a282437f3fcfd8346f8f68386f4fc74d
3e55f13bfc