[SSSD] [sssd PR#692][opened] pam_sss: return PAM_AUTHINFO_UNAVAIL if sc options are set

[sumit-bose]

URL: https://github.com/SSSD/sssd/pull/692
Author: sumit-bose
 Title: #692: pam_sss: return PAM_AUTHINFO_UNAVAIL if sc options are set
Action: opened

PR body:
"""
If pam_sss is called for PAM_USER root it currently returns
PAM_USER_UNKNOWN since SSSD does not handle root. To meet the documented
behavior if one to the sc options is used pam_sss should return
PAM_AUTHINFO_UNAVAIL in this case as well.

Related to https://pagure.io/SSSD/sssd/issue/3876
"""

To pull the PR as Git branch:
git remote add ghsssd https://github.com/SSSD/sssd
git fetch ghsssd pull/692/head:pr692
git checkout pr692