[SSSD] [sssd PR#1008][opened] sssd.spec.in: added missing Requires

[alexey-tikhonov]

   URL: https://github.com/SSSD/sssd/pull/1008
Author: alexey-tikhonov
 Title: #1008: sssd.spec.in: added missing Requires
Action: opened

PR body:
"""
This resolves warnings of rpmdiff tool.
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/1008/head:pr1008
git checkout pr1008