[SSSD] [sssd PR#943][opened] files_ops: Fix cached password remove

[elkoniu]

   URL: https://github.com/SSSD/sssd/pull/943
Author: elkoniu
 Title: #943: files_ops: Fix cached password remove
Action: opened

PR body:
"""
When SSSD daemon will detect refresh of password (group) file
it will delete all cached users (groups) data.
With this change cached data will be deleted only for non
existing users (groups).

Resolves:
https://pagure.io/SSSD/sssd/issue/3591
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/943/head:pr943
git checkout pr943