[sssd PR#1012][opened] config: add dns_resolver_op_timeout to option list

[thalman]

   URL: https://github.com/SSSD/sssd/pull/1012
Author: thalman
 Title: #1012: config: add dns_resolver_op_timeout to option list
Action: opened

PR body:
"""
Resolves:
https://pagure.io/SSSD/sssd/issue/3217

This is backport of commit 049f3906b9 into 1-16 branch
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/1012/head:pr1012
git checkout pr1012