wallet, rpc: add anti-fee-sniping to send and sendall

test/functional/wallet_rescan_unconfirmed.py

@@ -53,7 +53,7 @@ class WalletRescanUnconfirmed(BitcoinTestFramework):
         # The only UTXO available to spend is tx_parent_to_reorg.
         assert_equal(len(w0_utxos), 1)
         assert_equal(w0_utxos[0]["txid"], tx_parent_to_reorg["txid"])
-        tx_child_unconfirmed_sweep = w0.sendall([ADDRESS_BCRT1_UNSPENDABLE])
+        tx_child_unconfirmed_sweep = w0.sendall(recipients=[ADDRESS_BCRT1_UNSPENDABLE], options={"locktime":0})
         assert tx_child_unconfirmed_sweep["txid"] in node.getrawmempool()
         node.syncwithvalidationinterfacequeue()