Port PR93 from @denioD

qa/rpc-tests/mempool_resurrect_test.py

@@ -54,6 +54,7 @@ class MempoolCoinbaseTest(BitcoinTestFramework):
         spends2_id = [ self.nodes[0].sendrawtransaction(tx) for tx in spends2_raw ]
 
         blocks.extend(self.nodes[0].generate(1))
+        self.sync_all()
 
         # mempool should be empty, all txns confirmed
         assert_equal(set(self.nodes[0].getrawmempool()), set())
@@ -74,6 +75,8 @@ class MempoolCoinbaseTest(BitcoinTestFramework):
 
         # Generate another block, they should all get mined
         self.nodes[0].generate(1)
+        self.sync_all()
+        
         # mempool should be empty, all txns confirmed
         assert_equal(set(self.nodes[0].getrawmempool()), set())
         for txid in spends1_id+spends2_id: