horizon/keystone api should use internal_api NW
horizon/keystone api should use internal_api NW

As most of the OpenStack services are automatically bound
to the public virtual IP already we don't need to set
the default network for Horizon and Keystone to the 'external'
network. These should probably default to the internal_api
network like the rest of the OpenStack services...

Change-Id: I04cf64568c2fc7bb8a821b0de5ba56aa90158e2d

dprince/tripleo-heat-templates,bcrochet/tripleo-heat-templates,trozet/tripleo-heat-templates,wyg3958/tripleo-heat-templates,rdo-management/tripleo-heat-templates,trozet/tripleo-heat-templates,openstack/tripleo-heat-templates,wyg3958/tripleo-heat-templates,trozet/opnfv-tht,openstack/tripleo-heat-templates,dprince/tripleo-heat-templates,trozet/opnfv-tht,bcrochet/tripleo-heat-templates,trozet/opnfv-tht,bcrochet/tripleo-heat-templates,rdo-management/tripleo-heat-templates