Skip admin floating IP tests if router extension is disabled

The non-admin network API floating IP tests skip if the
router or network extensions are not enabled, but the admin
floating IP API tests don't have the same checks - so this
change adds those same checks to the admin tests.

Change-Id: Ie25f22d0c0d639c44c3595ca613a717a2874e3b3
Closes-Bug: #1618523
1 file changed