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
1 file changed