This commit adds the search filter to the job graphs on the homepage.
With this patch, users can know the specified jobs such as the
integrated tests like this filter[1].
[1] openstack-dev/devstack|openstack-infra/devstack-gate|openstack/(cinder|glance|keystone|nova|requirements|tempest)$
Change-Id: Ia8b8d0432048b912f67c35886a3284d6a4a92ac6
Partial-Bug: #1552700