test: pass dustrelayfee=0 option for tests using dust (instead of acceptnonstdtxn=1)

By specifying the `dustrelayfee=0` option instead of the more
generic `acceptnonstdtxn=1`, we can be more specific about what
part of the transaction is non-standard and can be sure that all
other aspects follow the standard policy.

test/functional/feature_dbcrash.py

@@ -62,8 +62,8 @@ class ChainstateWriteCrashTest(BitcoinTestFramework):
         self.node2_args = ["-dbcrashratio=24", "-dbcache=16"] + self.base_args
 
         # Node3 is a normal node with default args, except will mine full blocks
-        # and non-standard txs (e.g. txs with "dust" outputs)
-        self.node3_args = ["-blockmaxweight=4000000", "-acceptnonstdtxn"]
+        # and txs with "dust" outputs
+        self.node3_args = ["-blockmaxweight=4000000", "-dustrelayfee=0"]
         self.extra_args = [self.node0_args, self.node1_args, self.node2_args, self.node3_args]
 
     def setup_network(self):
@@ -211,7 +211,9 @@ class ChainstateWriteCrashTest(BitcoinTestFramework):
         self.crashed_on_restart = 0      # Track count of crashes during recovery
 
         # Start by creating a lot of utxos on node3
-        utxo_list = self.wallet.send_self_transfer_multi(from_node=self.nodes[3], num_outputs=5000)['new_utxos']
+        utxo_list = []
+        for _ in range(5):
+            utxo_list.extend(self.wallet.send_self_transfer_multi(from_node=self.nodes[3], num_outputs=1000)['new_utxos'])
         self.generate(self.nodes[3], 1, sync_fun=self.no_op)
         assert_equal(len(self.nodes[3].getrawmempool()), 0)
         self.log.info(f"Prepped {len(utxo_list)} utxo entries")

test/functional/wallet_basic.py

@@ -25,7 +25,7 @@ class WalletTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 4
         self.extra_args = [[
-            "-acceptnonstdtxn=1", "-walletrejectlongchains=0"
+            "-dustrelayfee=0", "-walletrejectlongchains=0"
         ]] * self.num_nodes
         self.setup_clean_chain = True
         self.supports_cli = False