Description of Problem:
Netgroup exports are of the form "@group"; when entered in cluadmin, this
produces a warning (even though it is a proper "client" name)


Version-Release number of selected component (if applicable):


How Reproducible:


Steps to Reproduce:
1. Create an NFS export;
2. attempt to export to a netgroup.

Actual Results:
See below.

Expected Results:
!warning.

Additional Information:

Do you want to (a)dd, (m)odify, (d)elete or (s)how NFS CLIENTS, or are you
(f)inished adding CLIENTS [f]: m
   0) linda                rw,no_root_squash
   c) cancel
Which of the above clients do you want to modify? 0
Export client name [linda]: @mygrp
Warning: Export client, @mygrp,  not valid

Export client name [@mygrp]: 
Export client options [rw,no_root_squash]: