heat-dsvm-functional enable build pip mirror
heat-dsvm-functional enable build pip mirror

HEAT_BUILD_PIP_MIRROR=True tells devstack to build a pip mirror from
the currently checked out heat agent projects (os-collect-config etc)
so that heat test vms can install those pip packages during boot
in preparation for integration tests with those agent projects.

'dib' is no longer a devstack service, so should not be enabled.

Change-Id: Ief47589d697f4cddb1613d4c93b13ab198c20846

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