message: [test] Fix wait condition in disconnect_p2ps
  MY_SUBVERSION is defined in messages.py as a byte string, but here we were
  comparing this value to the value returned by the RPC. Convert to ensure the
  types match.
diff: @@ -547,7 +547,7 @@ class TestNode():
  def num_test_p2p_connections(self):
  """Return number of test framework p2p connections to the node."""
  - return len([peer for peer in self.getpeerinfo() if peer['subver'] == MY_SUBVERSION])
  + return len([peer for peer in self.getpeerinfo() if peer['subver'] == MY_SUBVERSION.decode("utf-8")])
  def disconnect_p2ps(self):
  """Close all p2p connections to the node."""
  