Add diskimage-builder to legacy-rally-dsvm-verify jobs
Add diskimage-builder to legacy-rally-dsvm-verify jobs

[1][2][3] fail with lacking diskimage-builder package. This patch adds
such requirements to the job's descriptions.

[1] legacy-rally-dsvm-verify-full-create-resources
[2] legacy-rally-dsvm-verify-full-discover-resources
[3] legacy-rally-dsvm-verify-light-create-resources

Change-Id: I4f082abe56119e43f267d9cdb65b3dcae4d24cf4

openstack-infra/openstack-zuul-jobs,openstack-infra/openstack-zuul-jobs