zuul: Extend timeout for lvm-multiattach and cbak-ceph jobs

These jobs are frequently timing out with the default 2h
limit, extend them to 3 hours.
51c56f2 is one potential reason that these jobs are
taking longer to run now.

https://zuul.opendev.org/t/openstack/builds?job_name=cinder-tempest-plugin-lvm-multiattach&project=openstack/cinder-tempest-plugin
https://zuul.opendev.org/t/openstack/builds?job_name=cinder-tempest-plugin-cbak-ceph&project=openstack/cinder-tempest-plugin

Change-Id: Id0529a4f0a314996f8c0e8506596aefe0eb8648f
diff --git a/.zuul.yaml b/.zuul.yaml
index 51004ce..6bbcd1b 100644
--- a/.zuul.yaml
+++ b/.zuul.yaml
@@ -83,6 +83,7 @@
       - ^.*\.rst$
       - ^doc/.*$
       - ^releasenotes/.*$
+    timeout: 10800
 
 - job:
     name: cinder-tempest-plugin-lvm-barbican-base-abstract
@@ -219,6 +220,7 @@
         c-bak: true
       devstack_localrc:
         CINDER_QUOTA_VOLUMES: 25
+    timeout: 10800
 
 - job:
     name: cinder-tempest-plugin-cbak-ceph-zed