Don't run grenade on liberty
Don't run grenade on liberty

This moves the grenade jobs to not run on liberty (as kilo is no
longer a thing). The multinode special casing can be dropped because
it was working as of mitaka for nova-net and neutron, and the base
grenade definition does not include a $, so matches these.

Change-Id: I60c834c9a20e4a1eb10a24b2d0cf0080c65c399e

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