Remove -zapwallettxes

-zapwallettxes is made a hidden option to inform users that it is
removed and they should be using abandontransaction to do the stuck
transaction thing.

test/functional/test_runner.py

@@ -105,7 +105,6 @@ BASE_SCRIPTS = [
     'wallet_listtransactions.py',
     # vv Tests less than 60s vv
     'p2p_sendheaders.py',
-    'wallet_zapwallettxes.py',
     'wallet_importmulti.py',
     'mempool_limit.py',
     'rpc_txoutproof.py',