Timezone handling (#70)

* supply TZ info in php template

* should be already set in default_vars

* elgg - softcode timezone

* use supplied variable in php template

* guard against TZ not being present in env

roles/1-prep/tasks/computed_vars.yml

@@ -53,6 +53,10 @@
       value: '{{ ansible_product_uuid }}'
 
 # Put all computed vars here so derive properly from any prior var file
+- name: If the TZ is not set in env, set it to UTC
+  set_fact: local_tz='UTC'
+  when: local_tz == ""
+
 - name: Set port 80 for Admin Console
   set_fact:
     gui_port: 80