Until now-ish Volume v3 has been a pass-through to v2. In order
to prepare to make the Volume v3 commands stand-alone copy the
v2 functional tests to v3.
This is the first of a series of reviews to completely separate
Volume v2 and v3 commands. Once these are split we can begin to
implement v3 microversion support and/or start using the
OpenStack SDK as the REST library.
Change-Id: Iefd78d8ef6bb851d7360596337a88ee8f8476767
Signed-off-by: Dean Troyer <dtroyer@gmail.com>