scripted-diff: test: Rename send_message to send_without_ping

send_message only drops the bytes in a buffer and a sync is needed to
avoid intermittent test issues. Change the name of the method to make
this more apparent during review.

-BEGIN VERIFY SCRIPT-
 sed -i 's/send_message(/send_without_ping(/g' $( git grep -l 'send_message(' )
-END VERIFY SCRIPT-

test/functional/p2p_node_network_limited.py

@@ -40,7 +40,7 @@ class P2PIgnoreInv(P2PInterface):
     def send_getdata_for_block(self, blockhash):
         getdata_request = msg_getdata()
         getdata_request.inv.append(CInv(MSG_BLOCK, int(blockhash, 16)))
-        self.send_message(getdata_request)
+        self.send_without_ping(getdata_request)
 
 class NodeNetworkLimitedTest(BitcoinTestFramework):
     def set_test_params(self):