test: create txs with current nVersion (2) by default

This enables testing of BIP68 without the need of explicitly
setting nVersion to 2. This is e.g. useful for transactions
created with MiniWallet.

test/functional/feature_utxo_set_hash.py

@@ -69,8 +69,8 @@ class UTXOSetHashTest(BitcoinTestFramework):
         assert_equal(finalized[::-1].hex(), node_muhash)
 
         self.log.info("Test deterministic UTXO set hash results")
-        assert_equal(node.gettxoutsetinfo()['hash_serialized_2'], "221f245cf4c9010eeb7f5183d342c002ae6c1c27e98aa357dccb788c21d98049")
-        assert_equal(node.gettxoutsetinfo("muhash")['muhash'], "7c0890c68501f7630d36aeb3999dc924e63af084ae1bbfba11dd462144637635")
+        assert_equal(node.gettxoutsetinfo()['hash_serialized_2'], "3a570529b4c32e77268de1f81b903c75cc2da53c48df0d125c1e697ba7c8c7b7")
+        assert_equal(node.gettxoutsetinfo("muhash")['muhash'], "a13e0e70eb8acc786549596e3bc154623f1a5a622ba2f70715f6773ec745f435")
 
     def run_test(self):
         self.test_muhash_implementation()

test/functional/test_framework/messages.py

@@ -509,7 +509,7 @@ class CTransaction:
 
     def __init__(self, tx=None):
         if tx is None:
-            self.nVersion = 1
+            self.nVersion = 2
             self.vin = []
             self.vout = []
             self.wit = CTxWitness()