Move cells job from 'experimental' to 'check'
Move cells job from 'experimental' to 'check'

This was moved to experimental around FF to conserve resources by not
running a non voting job with known issues.  Now that things have slowed
down we'd like to start addressing CI cells issues so we can move
towards gating on it.

Change-Id: Ic32bd65d5eb7656c6383748a9e5ac585c665bda6

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