The previous diff touched most files in ./test/, so bump the headers to
avoid having to touch them again for a bump later.
-BEGIN VERIFY SCRIPT-
./contrib/devtools/copyright_header.py update ./test/
-END VERIFY SCRIPT-
For upgrade tests and possibly other tests, it is useful to inspect the
bdb file for the wallet (i.e. the wallet.dat file).
test_framework/bdb.py is an implementation of bdb file deserialization
specific for Bitcoin Core's usage.
