Use tempest_domain_name var for setting domain

Currently in tasks/tempest_resources.yml file, we are using
ansible provided openstack cloud modules which needs domain
name which is harded to default.

When os_tempest role is getting used with different deployment tool,
interface varies. Adding tempest_domain_name var mades it easier
to use any domain name in clouds.yaml file.

It replaces legacy domain-id with domain.

Change-Id: I157ac565ac93fcdd4c232beacbb4e33e42b55145

defaults/main.yml

@@ -288,6 +288,9 @@ tempest_tempest_conf_overrides: {}
 ## The name of cloud from clouds.yaml
 tempest_cloud_name: "default"
 
+## The name of domain from clouds.yaml
+tempest_domain_name: "default"
+
 # python-tempestconf variables
 # The tempest_use_tempestconf by default is set to false, set to true if you
 # want to generate the tempest.conf file with this tool, instead of

tasks/tempest_resources.yml

@@ -82,7 +82,7 @@
         state: present
         name: "{{ item }}"
         description: "{{ item }} project"
-        domain_id: "default"
+        domain: "{{ tempest_domain_name }}"
         interface: internal
         verify: "{{ not (keystone_service_internaluri_insecure | bool) }}"
       register: add_project
@@ -97,7 +97,7 @@
         state: present
         name: "{{ item.name }}"
         password: "{{ item.password | default(item.name) }}"
-        domain: default
+        domain: "{{ tempest_domain_name }}"
         default_project: "{{ item.project | default(item.name) }}"
         interface: internal
         verify: "{{ not (keystone_service_internaluri_insecure | bool) }}"