Title: #189: SELINUX: Use getseuserbyname to get IPA seuser
@fidencio I don't really know if this ticket is required anymore to be honest, it may
not be required after https://pagure.io/SSSD/sssd/issue/3297
I don't think any user is waiting for a fix, I will go ahead and close this PR and I
will leave the decision to close upstream ticket 3308 to your team.
See the full comment at https://github.com/SSSD/sssd/pull/189#issuecomment-318719796