Comment 2 for bug 1889380

<< This comes from openstackclient not tripleoclient

May be some issue in tripleoclient on how it's being implemented and thus warning is reported?
Actully i recently filed a bug https://bugs.launchpad.net/tripleo/+bug/1890389 not specifically for this warning. The issue in the other bug happens only when tripleoclient is installed, when it's not installed other clients works fine.

Also wrt the warning, it is not reported in all commands:-

[stack@standalone ~]$ python3 -c "import tripleoclient.v1.overcloud_deploy"
/usr/lib64/python3.6/importlib/_bootstrap.py:219: ImportWarning: can't resolve package from __spec__ or __package__, falling back on __name__ and __path__
  return f(*args, **kwds)
[stack@standalone ~]$ python3 -c "import tripleoclient.v1.tripleo_deploy"
[stack@standalone ~]$