CI: increase both limits to 3h

Our publishing job is barely managing to fit in 2h time so let add
another one.

Change-Id: Id9312830fb9961927ac8d317c432f52a4ad7af24
(cherry picked from commit 7e1d3eb)

Author: hrw

.zuul.d/base.yaml

@@ -40,8 +40,8 @@
 - job:
     name: kolla-base
     parent: base
-    timeout: 10200
-    post-timeout: 7200
+    timeout: 10800
+    post-timeout: 10800
     pre-run: tests/playbooks/pre.yml
     run: tests/playbooks/run.yml
     post-run: tests/playbooks/post.yml