Revert "Include microversion in OS_VOLUME_API_VERSION"
Revert "Include microversion in OS_VOLUME_API_VERSION"

This reverts commit db79bc8ed54f177b713fd68199785b3514c2055f.

Change-Id: Iaa2276aadae351fbc138de258c51d786f69e4395

openstack/tripleo-common,openstack/tripleo-common