Make NovaComputeOptVolumes and NovaComputeOptEnvVars role aware
Make NovaComputeOptVolumes and NovaComputeOptEnvVars role aware

Since multiple types of computes can be deployed, we should allow the
customization of these containers to be role specific.

Change-Id: Ie91633c2bcc8011cc62b46452ea5b444cf12029f

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