Improve domain support

Allow to set domain for admin authentication and dynamically provisioned
accounts.

Currently tempest admin user has to reside in the same domain as
dynamically provisioned accounts.

Change-Id: I1d5aa1f32bae42e2eeeed37588f6ca564563e57a

defaults/main.yml

@@ -286,7 +286,7 @@ tempest_tempest_conf_overrides: {}
 tempest_cloud_name: "default"
 
 ## The name of domain from clouds.yaml
-tempest_domain_name: "default"
+tempest_domain_name: "Default"
 
 ## The name of interface from clouds.yaml
 tempest_interface_name: "internal"

templates/tempest.conf.j2

@@ -12,7 +12,8 @@ use_dynamic_credentials = False
 test_accounts_file = {{ tempest_test_accounts_file_path }}
 {% else %}
 use_dynamic_credentials = True
-admin_domain_name = Default
+default_credentials_domain_name = {{ tempest_domain_name }}
+admin_domain_name = {{ tempest_domain_name }}
 admin_username = {{ keystone_admin_user_name }}
 admin_project_name = {{ keystone_admin_tenant_name }}
 admin_password = {{ keystone_auth_admin_password }}