Allow ipaapi user to access SSSD's info pipe
For smart card authentication, ipaapi must be able to access to sss-ifp.
During installation and upgrade, the ipaapi user is now added to
The commit also fixes two related issues:
* The server upgrade code now enables ifp service in sssd.conf. The
existing code modified sssd.conf but never wrote the changes to disk.
* sssd_enable_service() no longer fails after it has detected an
Signed-off-by: Christian Heimes <email@example.com>
Reviewed-By: Rob Crittenden <firstname.lastname@example.org>