c1c45df ipatests: always skip additional input for group-add-member --external

Authored and Committed by abbra 4 years ago
    ipatests: always skip additional input for group-add-member --external
    
    'ipa group-add-member groupname --external some-object' will attempt to
    ask interactive questions about other optional parameters (users and
    groups) if only external group member was specified. This leads to a
    timeout in the tests as there is no input provided.
    
    Do not wait for the entry that would never come by using 'ipa -n'.
    
    Related: https://pagure.io/freeipa/issue/8236
    Signed-off-by: Alexander Bokovoy <abokovoy@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <frenaud@redhat.com>
    Reviewed-By: Sergey Orlov <sorlov@redhat.com>