[SSSD] [sssd PR#778][opened] ipa s2n: try to remove objects not found on the server

[sumit-bose]

   URL: https://github.com/SSSD/sssd/pull/778
Author: sumit-bose
 Title: #778: ipa s2n: try to remove objects not found on the server
Action: opened

PR body:
"""
If there server returns that the searched object does not exists we should try
to remove it from the cache if it still has an entry.

Related to https://pagure.io/SSSD/sssd/issue/3984
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/778/head:pr778
git checkout pr778