neutron: don't execute lbaas api tests for kilo and earlier
neutron: don't execute lbaas api tests for kilo and earlier

Those branches do not have apiv1 and apiv2 tox environments.

Change-Id: I97433cf72f708b9a46a575931b308277d88045ec

coolsvap/project-config,openstack-infra/project-config,noorul/os-project-config,anbangr/osci-project-config,coolsvap/project-config,dongwenjuan/project-config,anbangr/osci-project-config,openstack-infra/project-config,Tesora/tesora-project-config,dongwenjuan/project-config,Tesora/tesora-project-config,noorul/os-project-config