[SSSD] [sssd PR#458][synchronized] overrides: fixes for sysdb_invalidate_overrides()

[sumit-bose]

URL: https://github.com/SSSD/sssd/pull/458
Author: sumit-bose
 Title: #458: overrides: fixes for sysdb_invalidate_overrides()
Action: synchronized

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/458/head:pr458
git checkout pr458