port test_quotas into 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: I0a72bc36684c66e0962e7ab2871b76a6e7a163bb
Merge "port test_quotas into v3 part1"