Add module to filter available volume services.

Add a way to filter which volume service is running on a host or list
which hosts run available volume services.

Closes-Bug: #2010490
Change-Id: Icb17f6019a61d9346472d83ddcd2ad29c340ea05

ci/roles/volume_service/defaults/main.yml

@@ -0,0 +1,9 @@
+expected_fields:
+  - availability_zone
+  - binary
+  - disabled_reason
+  - host
+  - name
+  - state
+  - status
+  - updated_at

ci/roles/volume_service/tasks/main.yml

@@ -0,0 +1,23 @@
+---
+- name: Fetch volume services
+  openstack.cloud.volume_service_info:
+    cloud: "{{ cloud }}"
+  register: volume_services
+
+- name: Assert return values of volume_service_info module
+  assert:
+    that:
+      - volume_services.volume_services | length > 0
+      # allow new fields to be introduced but prevent fields from being removed
+      - expected_fields|difference(volume_services.volume_services[0].keys())|length == 0
+
+- name: Fetch volume services with filters
+  openstack.cloud.volume_service_info:
+    cloud: "{{ cloud }}"
+    binary: "cinder-volume"
+  register: volume_services
+
+- name: Assert return values of volume_service_info module
+  assert:
+    that:
+      - volume_services.volume_services | length > 0