webadmin: Remove NICs from VM Guide Me

Since virtual network interfaces can now be added in the add VM dialog
itself, there's no longer need for them to take part in the following
Guide Me flow.

Change-Id: I870e7898f788e691741bfc4bc1b24c898ab4100b
Bug-Url: https://bugzilla.redhat.com/1024249
Signed-off-by: Lior Vernia <lvernia@redhat.com>