Fix permission check on SP update
    
    The permission check for owner was checking the wrong field,
    which would make it possible for anyone to update the Service
    Provider owner, making it possible for anyone to change the
    SP owner, allowing anyone to change the SP name.
    
    Fixes: CVE-2015-5217
    
    Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>
    Reviewed-by: Rob Crittenden <rcritten@redhat.com>