webadmin: Display default vNIC profile in tab

The user currently has no way of knowing we're intending to create
this profile, so now by default it's shown in the list of profiles to
be created for a network being added.

Change-Id: Iaa7b46a5cfd262bfdb9915993af0a1e524362055
Bug-Url: https://bugzilla.redhat.com/1000801
Signed-off-by: Lior Vernia <lvernia@redhat.com>