Pass env vars into tox buildimage sections
Pass env vars into tox buildimage sections

Change-Id: Ia447d5fef7dd09ad6a68c6516a07306f314247e1
Signed-off-by: George Melikov <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@gmelikov.ru>

openstack/manila-image-elements,openstack/manila-image-elements