[SSSD] [sssd PR#961][opened] INI: sssctl config-check command error messages

[thalman]

   URL: https://github.com/SSSD/sssd/pull/961
Author: thalman
 Title: #961: INI: sssctl config-check command error messages
Action: opened

PR body:
"""
In case of parsing error sssctl config-check command does not give
proper error messages with line number. With this patch the error
message is printed again.

Resolves:
https://pagure.io/SSSD/sssd/issue/4129
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/961/head:pr961
git checkout pr961