Adds Listen directive to openstack-dashboard vhost

This patch doesn't touch apache ports.conf as it is updated by apache
formula, instead adds Listen directive to openstack-dashboard.conf
when port is set to non default values 80 or 443.

Change-Id: Icd9a5dbe4a5e97083e146cecb3f73ad4236d9431
Related-PROD: PROD-15755
5 files changed