Fix wrong heat trustee configuration

"project_domain_id" and "project_name"
cannot be specified [trustee] section or keystone will throw a
"cannot be scoped to multiple targets" error when we attempt to get
a token scoped to a trust.

Change-Id: I167c0e31835d05b8069fd931ef76fb337dd99207
Closes-Bug: #1628353

ansible/roles/heat/templates/heat.conf.j2

@@ -66,9 +66,7 @@ auth_uri = {{ internal_protocol }}://{{ kolla_internal_fqdn }}:{{ keystone_publi
 auth_url = {{ admin_protocol }}://{{ kolla_internal_fqdn }}:{{ keystone_admin_port }}
 {% endif %}
 auth_plugin = password
-project_domain_id = default
 user_domain_id = default
-project_name = service
 username = {{ heat_keystone_user }}
 password = {{ heat_keystone_password }}