[SSSD] [sssd PR#553][synchronized] Use p11_child to verify certificates for the ssh responder

[sumit-bose]

   URL: https://github.com/SSSD/sssd/pull/553
Author: sumit-bose
 Title: #553: Use p11_child to verify certificates for the ssh responder
Action: synchronized

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/553/head:pr553
git checkout pr553