Fixed mempool sync after sending a transaction

Author: sdaftuar

qa/rpc-tests/receivedby.py

@@ -124,6 +124,7 @@ def run_test(self):
         balance_by_account = rec_by_accountArr = self.nodes[1].getreceivedbyaccount(account)
 
         txid = self.nodes[0].sendtoaddress(addr, 0.1)
+        self.sync_all()
 
         # listreceivedbyaccount should return received_by_account_json because of 0 confirmations
         check_array_result(self.nodes[1].listreceivedbyaccount(),