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/wallet_reorgsrestore.py

@@ -20,6 +20,7 @@ from test_framework.test_framework import BitcoinTestFramework
 from test_framework.util import (
         assert_equal,
         assert_greater_than,
+        assert_not_equal,
         assert_raises_rpc_error
 )
 
@@ -203,11 +204,11 @@ class ReorgsRestoreTest(BitcoinTestFramework):
         tx_after_reorg = self.nodes[1].gettransaction(txid)
         # Check that normal confirmed tx is confirmed again but with different blockhash
         assert_equal(tx_after_reorg["confirmations"], 2)
-        assert tx_before_reorg["blockhash"] != tx_after_reorg["blockhash"]
+        assert_not_equal(tx_before_reorg["blockhash"], tx_after_reorg["blockhash"])
         conflicted_after_reorg = self.nodes[1].gettransaction(conflicted_txid)
         # Check that conflicted tx is confirmed again with blockhash different than previously conflicting tx
         assert_equal(conflicted_after_reorg["confirmations"], 1)
-        assert conflicting["blockhash"] != conflicted_after_reorg["blockhash"]
+        assert_not_equal(conflicting["blockhash"], conflicted_after_reorg["blockhash"])
 
         # Verify we mark coinbase txs, and their descendants, as abandoned during startup
         self.test_coinbase_automatic_abandon_during_startup()