[SSSD] [sssd PR#496][opened] sysdb: sanitize search filter input

[sumit-bose]

   URL: https://github.com/SSSD/sssd/pull/496
Author: sumit-bose
 Title: #496: sysdb: sanitize search filter input
Action: opened

PR body:
"""
Backport of commit 1f2662c8f97c9c0fa250055d4b6750abfc6d0835
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/496/head:pr496
git checkout pr496