Make availble a list of alternative aut methods
    
    In the form case there is no way to automatically fallback to
    other auth methods or even repeat transparent methods.
    Add a simple list of alternative auth methods under the description
    box so that the user can easily switch back and forth between them
    if desired.
    
    Fixes: https://fedorahosted.org/ipsilon/ticket/96
    
    Signed-off-by: Simo Sorce <simo@redhat.com>
    Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>