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>