Modify infosssd plugin to fetch attributes from dbus
    
    This removes the need to do mapping of environment variables
    from mod_lookup_identity through Ipsilon, and fetches the
    attributes from infosssd via DBus. This also removes the
    mod_lookup_identiy config Installer within Ipsilon, and
    updates other references to it throughout the project.
    
    Merges: #146
    Signed-off-by: Dan Theisen <daniel.theisen@foresee.com>
    Reviewed-by: Patrick Uiterwijk <puiterwijk@redhat.com>