Don't assume that an enabled login plugin is available
For upgrades or other database corruption use a safer
method of getting a value from the list of available
login plugins.
This function can safely return None upon which the user
will be presented a login page with a list of mechanisms
to choose from.
https://fedorahosted.org/ipsilon/ticket/131
Signed-off-by: Rob Crittenden <rcritten@redhat.com>
Reviewed-by: Simo Sorce <simo@redhat.com>