webadmin: Removed dead code

Was there originally to enable removing a VNIC if hotplug was
available, but then the removal was disabled to make users explicitly
unplug VNIC first. The code stayed there, some of it was removed due
to findbugs findings but some was left.

Change-Id: I20391d81e8bdb439191f1b47e0b8825fbf6f5e4e
Signed-off-by: Lior Vernia <lvernia@redhat.com>