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

[jhrozek]

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

jhrozek commented:
"""
Is it on purpose that only Fedora-28 is added for now? Since there is also PR #793 would it make sense to also add the newer distributions here? (I can ack that PR first if you prefer to have all distros added to master first and then to sssd-1-16)
"""

See the full comment at https://github.com/SSSD/sssd/pull/796#issuecomment-479842874