Updated return value docs of compute_service_info module

We do no longer return computed values here. Note, this breaks backward
compatibility because we do no longer return the location attribute.
It was never documenteed anyway.

Change-Id: I11af9486a6a284d1756380548fca22435c43765a

ci/roles/nova_services/tasks/main.yml

@@ -7,6 +7,13 @@
   register: result
   failed_when: "result.openstack_compute_services | length <= 0"
 
+- name: Assert fields
+  assert:
+    that:
+      - '["availability_zone", "binary", "disabled_reason", "is_forced_down",
+          "host", "name", "state", "status", "updated_at", "id"] |
+          difference(result.openstack_compute_services.0.keys()) | length == 0'
+
 - name: Get nova conductor services info
   openstack.cloud.compute_service_info:
     cloud: "{{ cloud }}"