Add heat::trustee parameters
Add heat::trustee parameters

This is the prep work to use the new heat::trustee parameters and
defines parameter for the new class.

Depends-on: https://review.opendev.org/824827
Change-Id: I66a97b37bfaae0c5931d32ec877a6230b5b6cefd

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