[SSSD] [sssd PR#812][synchronized] Implement background refresh for IPA and AD domains and subdomains

[jhrozek]

   URL: https://github.com/SSSD/sssd/pull/812
Author: jhrozek
 Title: #812: Implement background refresh for IPA and AD domains and subdomains
Action: synchronized

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/812/head:pr812
git checkout pr812