Flip some debug messages to error messages in SAML2 provider
    
    Some failures were only being logged at the debug level which
    would be difficult if not impossible to track down on an
    operational server. This should give an operator a chance to
    figure out what is going on.
    
    https://fedorahosted.org/ipsilon/ticket/159
    
    Signed-off-by: Rob Crittenden <rcritten@redhat.com>
    Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>