port related volumes tests into nova v3 part1

This changeset only copies the v2 files into the appropriate v3
directories unchanged. This is being tried in order to make
reviewing of the porting easier as gerrit will display only what
is actually changed for v3 rather than entirely new files.

Partially implements blueprint nova-v3-api-tests

Change-Id: I8799257fa161ebf4c8b4bc437a94c7af746b1112
Merge "port related volumes tests into nova v3 part1"