[SSSD] [sssd PR#522][synchronized] Prepare SSSD to support IPA in trust to Samba AD

[abbra]

   URL: https://github.com/SSSD/sssd/pull/522
Author: abbra
 Title: #522: Prepare SSSD to support IPA in trust to Samba AD
Action: synchronized

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/522/head:pr522
git checkout pr522