[SSSD] [sssd PR#860][comment] Prepare for multiple enumeration providers

[centos-ci]

URL: https://github.com/SSSD/sssd/pull/860
Title: #860: Prepare for multiple enumeration providers

centos-ci commented:
"""
Can one of the admins verify this patch?
"""

See the full comment at https://github.com/SSSD/sssd/pull/860#issuecomment-518757431