telemetry: Don't enable panko on old branch
telemetry: Don't enable panko on old branch

Panko can't run on liberty and mitaka, so we disables it for this branches.

Change-Id: I752cc6029f3d84400610826f05cf3e600acb7541

openstack-infra/project-config,openstack-infra/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config