[rally] Add openstack/dib-utils to jobs requirements

The jobs `legacy-rally-dsvm-rally-heat` and
`legacy-rally-dsvm-magnum-rally` fail with the following error:

    rsync: change_dir "/home/zuul/src/*/openstack/dib-utils" failed: No such
    file or directory (2)

Hope, this patch will fix such errors.

Change-Id: Ic7e6da69ea034a2468b8936d7c67332c37d3bdeb

zuul.d/zuul-legacy-jobs.yaml

@@ -9977,6 +9977,7 @@
       - openstack-infra/devstack-gate
       - openstack/aodh
       - openstack/ceilometer
+      - openstack/dib-utils
       - openstack/diskimage-builder
       - openstack/ironic
       - openstack/magnum
@@ -10473,6 +10474,7 @@
       - openstack-infra/devstack-gate
       - openstack/aodh
       - openstack/ceilometer
+      - openstack/dib-utils
       - openstack/diskimage-builder
       - openstack/heat
       - openstack/ironic