message: Send fewer spam messages in p2p_invalid_messages
  Builds on travis are failing because the test node isn't
  able to drop all the bad messages sent within the given
  timeout. Reduce the number of bad messages we're sending
  and increase the timeout to avoid failures on travis.
diff: @@ -72,7 +72,7 @@ class InvalidMessagesTest(BitcoinTestFramework):
  "memory exhaustion. May take a bit...")
  # Run a bunch of times to test for memory exhaustion.
  - for _ in range(200):
  + for _ in range(80):
  node.p2p.send_message(msg_at_size)
  # Check that, even though the node is being hammered by nonsense from one
  @@ -82,7 +82,7 @@ class InvalidMessagesTest(BitcoinTestFramework):
  # Peer 1, despite serving up a bunch of nonsense, should still be connected.
  self.log.info("Waiting for node to drop junk messages.")
  - node.p2p.sync_with_ping(timeout=8)
  + node.p2p.sync_with_ping(timeout=30)
  assert node.p2p.is_connected
  #
  