To avoid creating empty volume for heat

1. when set heat_dev_mode to no, the volume will be empty[0],
this ps to avoid creating empty volume.

[0]: https://github.com/openstack/kolla-ansible/blob/master/ansible/roles/heat/defaults/main.yml#L13

Change-Id: Id22469442a4713f53646ffec2c5a960722fccb44

ansible/roles/heat/tasks/bootstrap_service.yml

@@ -20,6 +20,6 @@
       BOOTSTRAP:
     name: "bootstrap_heat"
     restart_policy: "never"
-    volumes: "{{ heat_api.volumes }}"
+    volumes: "{{ heat_api.volumes|reject('equalto', '')|list }}"
   run_once: True
   delegate_to: "{{ groups[heat_api.group][0] }}"

ansible/roles/heat/tasks/config.yml

@@ -100,7 +100,7 @@
     common_options: "{{ docker_common_options }}"
     name: "{{ item.value.container_name }}"
     image: "{{ item.value.image }}"
-    volumes: "{{ item.value.volumes }}"
+    volumes: "{{ item.value.volumes|reject('equalto', '')|list }}"
   register: check_heat_containers
   when:
     - kolla_action != "config"