Retype volume in volumes_client doesn't return a response body

[Felipe Monteiro]

The API retype_volume in v2 volumes_client doesn't return a response body, which is incorrect. Reference: https://github.com/openstack/tempest/blob/18ca366ebeabc87c977a92dbbeeba2cdd49b3947/tempest/lib/services/volume/v2/volumes_client.py#L320

[Nishad Shah (raigax9)]

https://review.openstack.org/#/c/483115/ (Added return statement in retype_volume)
https://review.openstack.org/#/c/483116/ (Added test case for retype_volume)

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/483115
Committed: https://git.openstack.org/cgit/openstack/tempest/commit/?id=d850882db21e718ad3d8cfea6ecc3b1336b7fc9c
Submitter: Jenkins
Branch: master

commit d850882db21e718ad3d8cfea6ecc3b1336b7fc9c
Author: raigax9 <email address hidden>
Date: Wed Jul 12 18:31:39 2017 -0400

    Added return statement to retype_volume in v2 volumes_client

    This commit adds a missing return statement to the retype_volume API
    endpoint in the v2 volumes_client. Otherwise, None, instead of an
    empty dict, is returned for the response body.

    Closes-Bug: #1703997
    Partially Implements: blueprint tempest-lib-missing-test-coverage
    Change-Id: I1a308f486fd7b14a9111a3433284e3c4abf65bd3

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tempest 17.0.0 release.