Move the daily periodic trigger earlier

The current time of 06:00 often clashes with the beginning of the
workday in Europe. Looking at current Grafana data, we seem to be having
a period of reduced load starting at around 00:00, so starting the
periodic jobs at 02:00 would hopefully allow us to better utilize our
resources.

Signed-off-by: Dr. Jens Harbott <harbott@osism.tech>
Change-Id: Id9ef2609b080040c68b42c07456ff92d73195304

zuul.d/pipelines.yaml

@@ -175,7 +175,7 @@
     precedence: low
     trigger:
       timer:
-        - time: '0 6 * * *'
+        - time: '0 2 * * *'
 
 - pipeline:
     name: deploy
@@ -289,7 +289,7 @@
     precedence: low
     trigger:
       timer:
-        - time: '1 6 * * *'
+        - time: '1 2 * * *'
     failure:
       smtp:
         from: zuul@openstack.org