Use hostnamectl to set the container hostname

This change sets the hostname of containers using the hostnamectl
command which has several enhancements over legacy method. By using
hostnamectl the command will validate the hostname for correctness
ensuring the container hostnames are conforming the the RFC.

The old methods have been removed and the command has been made part of
the handlers and will be run after the activation of dbus.

Change-Id: I158a5deb0685d2dcd436d7dd92caecb9966a025e
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

handlers/main.yml

@@ -72,13 +72,6 @@
   when:
     - lxc_container_enable_resolved | bool
 
-- name: Enable hostnamed
-  systemd:
-    name: systemd-hostnamed
-    state: started
-    enabled: true
-    daemon_reload: true
-
 - name: Enable dbus
   systemd:
     name: dbus
@@ -90,6 +83,19 @@
   systemd:
     daemon_reload: true
 
+- name: Start hostnamed
+  systemd:
+    name: systemd-hostnamed
+    state: started
+    enabled: true
+    daemon_reload: true
+  listen: Enable hostnamed
+
+- name: Set hostnamectl name
+  command: "/usr/bin/hostnamectl --static --pretty --transient set-hostname {{ inventory_hostname | replace('_', '-') | quote }}"
+  changed_when: false
+  listen: Enable hostnamed
+
 # NOTE(hwoarang) openSUSE randomly fails to start the service
 # with an error like the following one
 # sysctl-container.service: Failed at step CGROUP spawning /sbin/sysctl: No such device

tasks/lxc_container_config.yml

@@ -237,20 +237,6 @@
     mode: "0644"
   remote_user: root
 
-- name: Create hostname
-  copy:
-    dest: "/etc/hostname"
-    content: "{{ inventory_hostname | replace('_', '-') }}"
-    owner: "root"
-    group: "root"
-    mode: "0644"
-  remote_user: root
-
-- name: Setup hostname
-  command: hostname -F /etc/hostname
-  changed_when: false
-  remote_user: root
-
 - name: Ensure the hostnamed override directory exists
   file:
     path: "/etc/systemd/system/systemd-hostnamed.service.d"