Disabled fwaas plugin for horizon
Disabled fwaas plugin for horizon

Disabled fwaas plugin to prevent deployment crashing with horizon in
continuous restarting state due to missing image.

Change-Id: I44140f04ba793a039f6032739b64794ae7ad084d
Closes-bug: 1732937

openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,dprince/tripleo-heat-templates,openstack/tripleo-heat-templates