Fix 'tempest cleanup' for volume service client
Fix 'tempest cleanup' for volume service client

In below patch, volume service clients alias in cleint.py
has been changed and out under version checks condition.
- I1400a870de483f5cdf125eae2a9be68b46b54343

But tempest cleanup cmd used the alias not present for all
version and get no attribute error if volume v2 or v3 version
is configured.

Change-Id: I1d0d86417ce6d92bfa0ef450ceb70dd480978fe1
Closes-Bug: #1727569

openstack/tempest,openstack/tempest,masayukig/tempest,cisco-openstack/tempest,masayukig/tempest,cisco-openstack/tempest