Delegate compute wait tasks to service_setup_host

At the moment, we do deploy openrc file on conductors and delegate
task to them. At the moment there is no good reason to do so,
since we're actively utilizing service_setup_host for all interactions
with API. With that we also replace `openstack` commands with native
compute_service_info module that provides all information we need.

Change-Id: I016ba4c5dd211c5165a74a6011da7bb384c7a82a

tasks/main.yml

@@ -276,11 +276,7 @@
 - name: Flush handlers
   meta: flush_handlers
 
-# We delegate this back to the conductor because that is
-# where we want to isolate the clouds.yaml configuration,
-# rather than have it implemented on all compute nodes.
 - import_tasks: nova_compute_wait.yml
-  delegate_to: "{{ nova_conductor_setup_host }}"
   when:
     - "nova_services['nova-compute']['group'] in group_names"
     - "nova_discover_hosts_in_cells_interval | int < 1"

tasks/nova_compute_wait.yml

@@ -13,34 +13,37 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-- name: Implement openrc/clouds.yaml
-  include_role:
-    name: "openstack_openrc"
-
-- name: Set the delegated task facts
-  set_fact:
-    _wait_nova_bin: "{{ hostvars[nova_conductor_setup_host]['nova_bin'] | default(nova_bin) }}"
-
-- block:
+- name: Ensure compute is discovered
+  block:
     - name: Wait for the nova-compute service to initialize
-      command: "{{ _wait_nova_bin }}/openstack --os-cloud default compute service list --service nova-compute --format value --column Host"
-      changed_when: false
+      delegate_to: "{{ nova_service_setup_host }}"
+      vars:
+        ansible_python_interpreter: "{{ nova_service_setup_host_python_interpreter }}"
+      openstack.cloud.compute_service_info:
+        cloud: default
+        binary: "nova-compute"
+        host: "{{ compute_host_to_wait_for }}"
       register: _compute_host_list
       retries: 10
       delay: 5
-      until: "compute_host_to_wait_for in _compute_host_list.stdout_lines"
+      until: "_compute_host_list.compute_services"
 
   rescue:
     - name: Restart nova-compute service
       service:
         name: "{{ nova_services['nova-compute']['service_name'] }}"
         state: restarted
-      delegate_to: "{{ compute_host_to_wait_for }}"
 
     - name: Wait for the nova-compute service to initialize
-      command: "{{ _wait_nova_bin }}/openstack --os-cloud default compute service list --service nova-compute --format value --column Host"
+      delegate_to: "{{ nova_service_setup_host }}"
+      vars:
+        ansible_python_interpreter: "{{ nova_service_setup_host_python_interpreter }}"
+      openstack.cloud.compute_service_info:
+        cloud: default
+        binary: "nova-compute"
+        host: "{{ compute_host_to_wait_for }}"
       changed_when: false
       register: _compute_host_list
       retries: 10
       delay: 5
-      until: "compute_host_to_wait_for in _compute_host_list.stdout_lines"
+      until: "_compute_host_list.compute_services"