[freeipa PR#1112][opened] ipatests: use python3 if built with python3

[stlaz]

   URL: https://github.com/freeipa/freeipa/pull/1112
Author: stlaz
 Title: #1112: ipatests: use python3 if built with python3
Action: opened

PR body:
"""
Change the default python version for test scripts

https://pagure.io/freeipa/issue/7131
"""

To pull the PR as Git branch:
git remote add ghfreeipa https://github.com/freeipa/freeipa
git fetch ghfreeipa pull/1112/head:pr1112
git checkout pr1112