Increase the zuul tasks timeout

As some of our build tasks fail on timeout from time to time, I am
changing the timeout for the build tasks to 3 hours (10800 seconds).
Hopefully this will resolve the timeout. If not, we should check with
the openstack-infra team to find the root cause for these timeouts.

P.S. Tried the syntax in the following URL:
https://specs.openstack.org/openstack-infra/infra-specs/specs/zuulv3.html#jobs
but it still does not work - changed to seconds

Change-Id: I371430e4b4c312c034fc88f4a959bb563e53d2de

.zuul.yaml

@@ -24,7 +24,7 @@
     parent: legacy-dsvm-base
     run: zuul/dragonflow-dsvm-fullstack-redis/run
     post-run: zuul/dragonflow-dsvm-fullstack-redis/post
-    timeout: 9900
+    timeout: 10800
     required-projects:
       - openstack-infra/devstack-gate
       - openstack/dragonflow
@@ -37,7 +37,7 @@
     parent: legacy-dsvm-base
     run: zuul/dragonflow-dsvm-fullstack-etcd-zmq/run
     post-run: zuul/dragonflow-dsvm-fullstack-etcd-zmq/post
-    timeout: 9900
+    timeout: 10800
     required-projects:
       - openstack-infra/devstack-gate
       - openstack/dragonflow
@@ -50,7 +50,7 @@
     parent: legacy-dsvm-base
     run: zuul/dragonflow-dsvm-rally/run
     post-run: zuul/dragonflow-dsvm-rally/post
-    timeout: 7800
+    timeout: 10800
     required-projects:
       - openstack-infra/devstack-gate
       - openstack/dragonflow
@@ -64,7 +64,7 @@
     parent: legacy-dsvm-base
     run: zuul/tempest-dsvm-dragonflow/run
     post-run: zuul/tempest-dsvm-dragonflow/post
-    timeout: 7800
+    timeout: 10800
     required-projects:
       - openstack-infra/devstack-gate
       - openstack/dragonflow