Updated openstack/openstack
Project: openstack/tempest  add5b7d6422cbd2199766410c2ff7892420c4119

Remove Nova v3 API code from RestClient

Nova v3 API has disappeared, and Tempest isn't testing the API on the
gate now. In addition, Nova team is creating a new REST API "Nova v2.1
API + microversions" and the interfaces are different from v3 API.
So it is not necessary to keep Nova v3 API tests in Tempest.
This patch removes Nova v3 API code from RestClient for code cleanup.

Change-Id: I46631092e1c851f4603035c3dcc11287b777323c