Backported changes to identity_role_info from master branch

Added ci integration tests, updated return value documentation and
refactored to simplify code.

Change-Id: If8a1145a31d685d41367383930e6fd08d64c6ae8
(cherry picked from commit 1d22a94a90)

ci/roles/identity_role_info/tasks/main.yml

@@ -0,0 +1,62 @@
+- name: Ensure role does not exist before tests
+  openstack.cloud.identity_role:
+    cloud: "{{ cloud }}"
+    state: absent
+    name: test_role
+
+- name: Get unexistent role
+  openstack.cloud.identity_role_info:
+    cloud: "{{ cloud }}"
+    name: test_role
+  register: roleinfo
+
+- debug:
+    var: roleinfo
+
+- name: Assert that no results were returned
+  assert:
+    that: not roleinfo.openstack_roles
+
+- name: Create keystone role
+  openstack.cloud.identity_role:
+    cloud: "{{ cloud }}"
+    state: present
+    name: test_role
+
+- name: Create second role
+  openstack.cloud.identity_role:
+    cloud: "{{ cloud }}"
+    state: present
+    name: test_role2
+
+- name: Get role by name
+  openstack.cloud.identity_role_info:
+    cloud: "{{ cloud }}"
+    name: test_role
+  register: roleinfo
+
+- debug:
+    var: roleinfo
+
+- name: Assert that only one result was returned
+  assert:
+    that: roleinfo.openstack_roles | length == 1
+
+- name: Assert that roleinfo has fields
+  assert:
+    that: item in roleinfo.openstack_roles[0]
+  loop:
+    - domain_id
+    - id
+    - name
+
+- name: Post-test cleanup
+  block:
+  - name: Clean up roles
+    openstack.cloud.identity_role:
+      cloud: "{{ cloud }}"
+      state: absent
+      name: "{{ item }}"
+    loop:
+      - test_role
+      - test_role2

ci/run-collection.yml

@@ -20,6 +20,7 @@
     - { role: identity_user, tags: identity_user }
     - { role: identity_user_info, tags: identity_user_info }
     - { role: identity_role, tags: identity_role }
+    - { role: identity_role_info, tags: identity_role_info }
     - { role: image, tags: image }
     - { role: keypair, tags: keypair }
     - { role: keystone_domain, tags: keystone_domain }