Revert "Explicitly store date facts for promote"

This reverts commit ef7ab67356.

It does not work, because running setup is not
allowed in promote pipelines (even if it's a partial
fact gathering). This is a problem, as it will
cause all the promote pipelines to fail.

It should therefore be reverted as fast as possible.

Change-Id: Ib0b6ef059da4c65102343d7b4f26fee6be180ebc

playbooks/docker-image/promote.yaml

@@ -1,9 +1,3 @@
 - hosts: localhost
-  # The gather_facts need to stay on smart (default on zuul executor)
-  # to keep the fact gathered to a minimum.
-  pre_tasks:
-    - name: Gather minimal set of facts
-      setup:
-        filter: ansible_date_time
   roles:
     - promote-docker-image