ipatests: Test for sequence processing failures with server context
    
    1 : Test to verify that groups have correct userclass when
    external is set to true or false with group-add.
    2 : After creating a nonposix group verify that all
    following group_add calls to add posix groups calls are
    not failing with missing attribute.
    
    Related: https://pagure.io/freeipa/issue/9349
    
    Signed-off-by: mbhalodi <mbhalodi@redhat.com>
    Reviewed-By: Michal Polovka <mpolovka@redhat.com>
    Reviewed-By: Anuja More <amore@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Antonio Torres <antorres@redhat.com>