Fix consoleauth/spice duplicates on RH (#1278452)

On RedHat, consoleauth and spicehtml5proxy packages has the same name
(« openstack-nova-console »), so we have a duplicate resource (see: #1278452).
In this context we can't use ensure_package of stdlib because we loose
notify/names attributes.)

Closes-bug: #1278452

Change-Id: I0141ca0233aead072a06796759d211cf1b6dc657
Expose vif_plugging parameters

Allow vif_plugging_is_fatal and vif_plugging_timeout parameters to be
modified to support configurations in which neutron vif plugging events
will not be sent to nova.

Change-Id: I92a854311b391e8dc27fe1ad9da80bfbea4041c2
Merge "Expose vif_plugging parameters"