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/feature_versionbits_warning.py

@@ -47,7 +47,7 @@ class VersionBitsWarningTest(BitcoinTestFramework):
         for _ in range(numblocks):
             block = create_block(tip, create_coinbase(height + 1), block_time, version=version)
             block.solve()
-            peer.send_message(msg_block(block))
+            peer.send_without_ping(msg_block(block))
             block_time += 1
             height += 1
             tip = block.sha256