Run functional devstack job on ansible collection

Porting of job that was running on patches in Ansible.

Change-Id: Ifa5a6b40d6a0f1de9f2cbc917a55c2d0e8ac421d

ci/roles/keystone_role/tasks/main.yml

@@ -0,0 +1,12 @@
+---
+- name: Create keystone role
+  openstack.cloud.os_keystone_role:
+     cloud: "{{ cloud }}"
+     state: present
+     name: "{{ role_name }}"
+
+- name: Delete keystone role
+  openstack.cloud.os_keystone_role:
+     cloud: "{{ cloud }}"
+     state: absent
+     name: "{{ role_name }}"