deprecate use of tenant in configs

OpenStack has settled (a very long time ago) on project to represent
the container which has users. We should make tempest configs always
use project versions of these names. This deprecates the old tenant
versions of these names, and makes project version the prefered
option.

Change-Id: Ied68c0326cf891a4e6eb3db51dc5f43241e4b8d2
29 files changed