test: create assert_not_equal util and add to where imports are needed

In the functional tests there are lots of cases where we assert != which
this new util will replace, we also are adding the imports and the new assertion

test/functional/p2p_orphan_handling.py

@@ -28,6 +28,7 @@ from test_framework.p2p import (
     TXID_RELAY_DELAY,
 )
 from test_framework.util import (
+    assert_not_equal,
     assert_equal,
 )
 from test_framework.test_framework import BitcoinTestFramework
@@ -116,7 +117,7 @@ class PeerTxRelayer(P2PTxInvStore):
         self.sync_with_ping()
         for getdata in self.getdata_received:
             for request in getdata.inv:
-                assert request.hash != txhash
+                assert_not_equal(request.hash, txhash)
 
 class OrphanHandlingTest(BitcoinTestFramework):
     def set_test_params(self):
@@ -149,7 +150,7 @@ class OrphanHandlingTest(BitcoinTestFramework):
         tx_bad_wit.wit.vtxinwit[0].scriptWitness.stack = [b'garbage']
 
         assert_equal(tx["txid"], tx_bad_wit.rehash())
-        assert tx["wtxid"] != tx_bad_wit.getwtxid()
+        assert_not_equal(tx["wtxid"], tx_bad_wit.getwtxid())
 
         return tx_bad_wit
 
@@ -410,8 +411,8 @@ class OrphanHandlingTest(BitcoinTestFramework):
         assert_equal(parent_low_fee_nonsegwit["txid"], parent_low_fee_nonsegwit["tx"].getwtxid())
         child = self.wallet.create_self_transfer(utxo_to_spend=parent_low_fee_nonsegwit["new_utxo"])
         grandchild = self.wallet.create_self_transfer(utxo_to_spend=child["new_utxo"])
-        assert child["txid"] != child["tx"].getwtxid()
-        assert grandchild["txid"] != grandchild["tx"].getwtxid()
+        assert_not_equal(child["txid"], child["tx"].getwtxid())
+        assert_not_equal(grandchild["txid"], grandchild["tx"].getwtxid())
 
         # Relay the parent. It should be rejected because it pays 0 fees.
         self.relay_transaction(peer1, parent_low_fee_nonsegwit["tx"])