Copy system localtime when creating container cache

Containers should use the same TZ setting as the host machine. This
change ensures that all containers created are using iheriting the
system's "/etc/localtime" which ensurs that the container and the host
are running on the same TZ at build time.

Change-Id: Ica571d9dc280bf46be475b6a83ada47fd3410d92
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>

vars/redhat-7.yml

@@ -48,6 +48,7 @@ lxc_cache_map:
   copy_from_host:
     - /etc/yum.repos.d/
     - /etc/pki/rpm-gpg/
+    - /etc/localtime
   cache_prep_commands: |
     if [ -a /etc/resolv.conf ]; then
       mv /etc/resolv.conf /etc/resolv.conf.org

vars/ubuntu-14.04.yml

@@ -46,6 +46,7 @@ lxc_cache_map:
   copy_from_host:
     - /etc/apt/sources.list
     - /etc/apt/apt.conf.d/
+    - /etc/localtime
     - /root/repo.keys
   cache_prep_commands: |
     if [ -a /etc/resolv.conf ]; then

vars/ubuntu-16.04.yml

@@ -47,6 +47,7 @@ lxc_cache_map:
   copy_from_host:
     - /etc/apt/sources.list
     - /etc/apt/apt.conf.d/
+    - /etc/localtime
     - /root/repo.keys
   cache_prep_commands: |
     if [ -a /etc/resolv.conf ]; then