Change the specs for reverting cinder api to v1

Since there are many problems when applying cinder v2 api, like
cannot attach volumes to VM from nova, and there may be other
problems in glance, the integration of cinder v2 api and
other services is not well tested and the related configurations
are not clear. We'd better revert the cinder api version back to
v1 before all things are clear.

This patch may break cookbook-openstack-block-storage unless the
patch https://review.openstack.org/#/c/132517/ is merged.

Closes-bug: #1388741
Change-Id: I39cd138fe7cb6fe685df12403ff81aad8906d134
Merge "Change the specs for reverting cinder api to v1"