FIX inject password error

The envirenment variable LIBGUESTFS_BACKEND = direct
is not enabled by default in docker container.
Without it, GuestFS() init failed.

Closes-Bug: #1742029

Change-Id: I24330502df7abc8e8f952ebb41bd9ae5e4ba1168

ansible/roles/nova/defaults/main.yml

@@ -110,6 +110,8 @@ nova_services:
     container_name: "nova_compute"
     group: "compute"
     image: "{{ nova_compute_image_full }}"
+    environment:
+        LIBGUESTFS_BACKEND: "direct"
     privileged: True
     enabled: "{{ not enable_nova_fake | bool }}"
     ipc_mode: "host"

ansible/roles/nova/handlers/main.yml

@@ -253,6 +253,7 @@
     action: "recreate_or_restart_container"
     common_options: "{{ docker_common_options }}"
     name: "{{ service.container_name }}"
+    environment: "{{ service.environment | default(omit) }}"
     image: "{{ service.image }}"
     privileged: "{{ service.privileged | default(False) }}"
     ipc_mode: "{{ service.ipc_mode | default(omit) }}"

ansible/roles/nova/tasks/config.yml

@@ -178,6 +178,7 @@
     common_options: "{{ docker_common_options }}"
     name: "{{ item.value.container_name }}"
     image: "{{ item.value.image }}"
+    environment: "{{ item.value.environment|default(omit) }}"
     pid_mode: "{{ item.value.pid_mode|default('') }}"
     ipc_mode: "{{ item.value.ipc_mode|default(omit) }}"
     privileged: "{{ item.value.privileged|default(False) }}"