Fix formatting of LXC container config files

Spacing changes were inadvertently introduced in
https://review.opendev.org/742121 which result in duplicate entries
in LXC config files.

This commit reverts to the original formatting with spaces either
side of the '=', although it makes no attempt to fix files which
may already include duplicate entries.

Change-Id: Ia95bbc959b54f494b5861afcb4e84d4c227e7b31

tasks/lxc_container_config.yml

@@ -17,7 +17,7 @@
 - name: Write default container config
   lineinfile:
     dest: "/var/lib/lxc/{{ inventory_hostname }}/config"
-    line: "{{ item }}"
+    line: "{{ item.split('=', 1)[0] }} = {{ item.split('=', 1)[1] }}"
     backup: "true"
   with_items: "{{ lxc_container_default_config_list | union(lxc_container_config_list) }}"
   delegate_to: "{{ physical_host }}"