[SSSD] [sssd PR#796][opened] ci: enable sssd-ci for 1-16 branch

[pbrezina]

URL: https://github.com/SSSD/sssd/pull/796
Author: pbrezina
 Title: #796: ci: enable sssd-ci for 1-16 branch
Action: opened

PR body:
"""
Fedora 28 is the latest version containing 1.16 so I think it is fine
to not run the test against Fedora 29+. Besides this change this patch
contains files from master without change.

(including PR 793 that is not yet merge)
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/796/head:pr796
git checkout pr796