Comment 9 for bug 1508249

Reviewed: https://review.openstack.org/263473
Committed: https://git.openstack.org/cgit/openstack/cinder/commit/?id=3ef58dd656d6fdf08457f16a2a39b0fbffd3c2ca
Submitter: Jenkins
Branch: master

commit 3ef58dd656d6fdf08457f16a2a39b0fbffd3c2ca
Author: Nate Potter <email address hidden>
Date: Mon Jan 4 23:10:19 2016 +0000

    Roll back reservations quota in RPC if necessary

    Currently the latest version of the volume rpcapi passes along
    old_reservations in retype whereas older versions do not. In the
    case where old_reservations aren't passed, they will be checked again
    in c-vol. This patch rolls back the quotas that were checked for
    old_reservations if the client can't send the latest version in
    the RPCAPI so that they aren't reserved twice.

    This is an amendment to this recently merged patch:
    Iba24edd8ad824837028353b52c90742df55c9173

    Closes-Bug: 1546089
    Related-bug: 1508249
    Change-Id: I54b39f367b8552ed5e932c71265432e7cf72c073