message: Remove assert for sync_with_ping()
  sync with ping is somewhat useful to make sure we don't start checking
  to early but is also somewhat unreliable because of the multi threading
  an therefore we can get false positives on failure.
diff: @@ -588,7 +588,7 @@ class P2PDataStore(SingleNodeConnCB):
  lambda: blocks[-1].sha256 in self.getdata_requests, timeout=timeout)
  assert ok, "did not receive getdata for {}".format(blocks[-1].sha256)
  - assert self.sync_with_ping()
  + self.sync_with_ping()
  if success:
  ok = wait_until(lambda: node.getbestblockhash() ==
  @@ -626,7 +626,7 @@ class P2PDataStore(SingleNodeConnCB):
  for tx in txs:
  self.send_message(msg_tx(tx))
  - assert self.sync_with_ping()
  + self.sync_with_ping()
  if success:
  # Check that all txs are now in the mempool
  