Create the nova instances directory when need during starting

The /var/lib/nova/instances should be create if it do not exist
during starting nova-compute container. Rather than create it
at the bootstrap service stage.

Change-Id: Ibcc5fb8eec0b38cf2b4313f48d1beb3ba83b1e85
Closes-Bug: #1614970

ansible/roles/nova/tasks/bootstrap_service.yml

@@ -18,36 +18,3 @@
       - "kolla_logs:/var/log/kolla/"
   run_once: True
   delegate_to: "{{ groups['nova-api'][0] }}"
-
-- name: Creating nova-compute volume
-  kolla_docker:
-    action: "create_volume"
-    common_options: "{{ docker_common_options }}"
-    name: "nova_compute"
-  register: nova_compute_volume
-  when:
-    - inventory_hostname in groups['compute']
-    - not enable_nova_fake | bool
-
-- name: Running Nova compute bootstrap container
-  kolla_docker:
-    action: "start_container"
-    common_options: "{{ docker_common_options }}"
-    detach: False
-    environment:
-      KOLLA_BOOTSTRAP:
-      KOLLA_CONFIG_STRATEGY: "{{ config_strategy }}"
-    image: "{{ nova_compute_image_full }}"
-    labels:
-      BOOTSTRAP:
-    name: "bootstrap_nova_compute"
-    restart_policy: "never"
-    volumes:
-      - "{{ node_config_directory }}/nova-compute/:{{ container_config_directory }}/:ro"
-      - "/etc/localtime:/etc/localtime:ro"
-      - "kolla_logs:/var/log/kolla/"
-      - "nova_compute:/var/lib/nova/"
-  when:
-    - inventory_hostname in groups['compute']
-    - not enable_nova_fake | bool
-    - nova_compute_volume.changed

docker/nova/nova-compute/extend_start.sh

@@ -1,8 +1,5 @@
 #!/bin/bash
 
-# Bootstrap and exit if KOLLA_BOOTSTRAP variable is set. This catches all cases
-# of the KOLLA_BOOTSTRAP variable being set, including empty.
-if [[ "${!KOLLA_BOOTSTRAP[@]}" ]]; then
+if [[ ! -d /var/lib/nova/instances ]]; then
     mkdir -p /var/lib/nova/instances
-    exit 0
 fi