Remove dibtest from experimental queue
Remove dibtest from experimental queue

dibtest isn't getting nodes allocated it preventing other experimental
jobs in devstack-gate from reporting back. This is blocking the testing
of the aiopcpu jobs

Change-Id: I671ce746d9009b5458d72eab396d9d66d5b19bb2

noorul/os-project-config,openstack-infra/project-config,coolsvap/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config,citrix-openstack/project-config,open-switch/infra_project-config,coolsvap/project-config,openstack-infra/project-config,anbangr/osci-project-config,dongwenjuan/project-config,dongwenjuan/project-config,citrix-openstack/project-config,anbangr/osci-project-config,noorul/os-project-config,open-switch/infra_project-config