Share console-auth-tokens tests between V2 & V2.1

As V2 and V2.1 'os-console-auth-tokens' extensions are same,
unit tests can be shared between those.

This patch share the tests between V2 & V2.1

Partially implements blueprint v2-on-v3-api

Change-Id: I9c1ff61ff73fee551a60a0ff684dd73a1bbad72e
Merge "Share console-auth-tokens tests between V2 & V2.1"