Replace systemd-mount template with role

To reduce role complexity we replace separatelly maintained template
with systemd_mount role that is widely used across OSA.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/836945
Change-Id: I23632f9c145be334b1d19067352f8b82114a1209

files/var-lib-machines.mount

@@ -1,19 +0,0 @@
-#  This file is part of systemd.
-#
-#  systemd is free software; you can redistribute it and/or modify it
-#  under the terms of the GNU Lesser General Public License as published by
-#  the Free Software Foundation; either version 2.1 of the License, or
-#  (at your option) any later version.
-
-[Unit]
-Description=Virtual Machine and Container Storage
-ConditionPathExists=/var/lib/machines.raw
-
-[Mount]
-What=/var/lib/machines.raw
-Where=/var/lib/machines
-Type=ext4
-Options=loop,defaults,noatime,nodiratime
-
-[Install]
-WantedBy=multi-user.target

handlers/main.yml

@@ -32,27 +32,6 @@
     name: "systemd-importd.service"
     state: "restarted"
 
-- name: Enable machines mount
-  systemd:
-    daemon_reload: yes
-    name: "var-lib-machines.mount"
-    enabled: "yes"
-  listen: Start machines mount
-
-# NOTE(cloudnull): The systemd module is not used to start the
-#                  mount because we dont want to "restart" the
-#                  mount unnecessarily. To ensure we're able to
-#                  load new options without requiring a mount
-#                  restart the systemctl command is used with
-#                  the "reload-or-restart" argument.
-- name: Start or reload the machines mount
-  command: "systemctl reload-or-restart var-lib-machines.mount"
-  args:
-    warn: no
-  listen: Start machines mount
-  tags:
-    - skip_ansible_lint
-
 - name: Restart irqbalance
   systemd:
     name: "irqbalance"

tasks/lxc_cache_rootfs.yml

@@ -26,30 +26,20 @@
   when:
     - machines_create is changed
 
-- name: Create machines mount point
-  file:
-    path: "/var/lib/machines"
-    state: "directory"
-    recurse: true
-
-- name: Move machines mount into place
-  copy:
-    src: var-lib-machines.mount
-    dest: /lib/systemd/system/var-lib-machines.mount
-  register: mount_unit
-
-- name: Reload the System daemon
-  systemd:
-    daemon_reload: yes
-  when: mount_unit is changed
-
-- name: Mount all
-  shell: "mount | grep '/var/lib/machines' || (systemctl start var-lib-machines.mount && exit 3)"
-  register: mount_machines
-  changed_when: mount_machines.rc == 3
-  failed_when: mount_machines.rc not in [0, 3]
-  tags:
-    - skip_ansible_lint
+- name: Create systemd mount
+  import_role:
+    name: systemd_mount
+  vars:
+    systemd_mounts:
+      - what: '/var/lib/machines.raw'
+        where: '/var/lib/machines'
+        type: 'ext4'
+        options: 'loop'
+        unit:
+          ConditionPathExists:
+            - '/var/lib/machines.raw'
+        state: 'started'
+        enabled: true
 
 - name: Remove the old image cache
   file: