Update to latest oslo-version.

Remove the need for versioninfo file and just use python's PKG-INFO.

Change-Id: I4765141e9bf3fa075dfbbc6a07e495c29e12177b
Expect minumum warlock version of 0.7.0

Change-Id: Ic2ef17f29ebd4c157a8ccf7a52b9c74e0c17a54e
Add library support for v2 image update

Related to bp glance-client-v2

Change-Id: Ia6fe16e462ce8827175577cbed8e15c326bf8ad3
Merge "Expect minumum warlock version of 0.7.0"
Merge "Add library support for v2 image update"
Merge "Update to latest oslo-version."