Remove timezone playbook

It is time.

Change-Id: I25fd8d4e4bcef4b015a1634ace927e37aa2e80a9

ansible/timezone.yml

----
-# Timezone configuration has moved to time.yml.
-# This will be removed in the Xena release.
-
-# NOTE(wszumski): Making this a non-empty playbook has the benefit of
-# silencing the tox syntax check which doesn't like empty playbooks.
-
-- hosts: localhost
-  tasks:
-    - name: Warn about deprecation of this playbook
-      fail:
-        msg: |
-          This playbook has been deprecated, please use time.yml instead.
-          Kayobe should not run this playbook, so if you are seeing this
-          message then either something has gone wrong, or you are trying
-          to run it manually. This playbook will be removed in the Xena
-          release.
-      # NOTE(wszumski): We want this to print a nice big red warning and
-      # not to fail the run.
-      ignore_errors: yes
-
-- import_playbook: time.yml