test: replace (send_message + sync_with_ping) with send_and_ping

test/functional/p2p_tx_download.py

@@ -65,8 +65,7 @@ class TxDownloadTest(BitcoinTestFramework):
         self.log.info("Announce the txid from each incoming peer to node 0")
         msg = msg_inv([CInv(t=1, h=txid)])
         for p in self.nodes[0].p2ps:
-            p.send_message(msg)
-            p.sync_with_ping()
+            p.send_and_ping(msg)
 
         outstanding_peer_index = [i for i in range(len(self.nodes[0].p2ps))]
 
@@ -107,8 +106,7 @@ class TxDownloadTest(BitcoinTestFramework):
             "Announce the transaction to all nodes from all {} incoming peers, but never send it".format(NUM_INBOUND))
         msg = msg_inv([CInv(t=1, h=txid)])
         for p in self.peers:
-            p.send_message(msg)
-            p.sync_with_ping()
+            p.send_and_ping(msg)
 
         self.log.info("Put the tx in node 0's mempool")
         self.nodes[0].sendrawtransaction(tx)