Adapt job timeouts

There were some integration tests running into timeouts while they were
almost finished, so let us increase the timeout for them from 1h to
90mins.

The openstack-chef-delivery job otoh takes only a couple of minutes
usually, so reduce the timeout from 45min to 30min.

Change-Id: I11601843293d1e0c04b4fafb8019261f20cb50ff

.zuul.yaml

@@ -5,7 +5,7 @@
     required-projects: openstack/openstack-chef
     pre-run: playbooks/pre.yaml
     run: playbooks/delivery.yaml
-    timeout: 2700
+    timeout: 1800
 
 - job:
     name: openstack-chef-integration
@@ -15,7 +15,7 @@
     pre-run: playbooks/pre.yaml
     run: playbooks/integration.yaml
     post-run: playbooks/post.yaml
-    timeout: 3600
+    timeout: 5400
 
 - project-template:
     name: openstack-chef-jobs