vif: Remove 'plug_vhostuser', 'unplug_vhostuser'
vif: Remove 'plug_vhostuser', 'unplug_vhostuser'

These will never be reached since the '_nova_to_osvif_vif_vhostuser'
function in the 'nova.network.os_vif_util' provides as fallthrough case
since change Ifab3006454708ab290b93f02d82b794c334c3946.

Change-Id: I14ab55178692ff13df114a4c628430561df1a55e
Signed-off-by: Stephen Finucane <492121341a95b3c3aab646bed44634f739dd019b@redhat.com>

rahulunair/nova,mahak/nova,klmitch/nova,klmitch/nova,openstack/nova,klmitch/nova,openstack/nova,mahak/nova,klmitch/nova,openstack/nova,rahulunair/nova,mahak/nova,rahulunair/nova