Enable configuration of Identity API v3

* Default IDENTITY_API_VERSION to '2.0' in stackrc

Note: the value of these *_API_VERSION variables will NOT include
the leading 'v' as the CLI tools do not allow it.

Change-Id: Ic6473833be35625282e7442f3c88fc1c4d0cc134
Set the correct links in the version return

Change-Id: I049789f568eff48c1abb0678c3ac0ae8a8960c64
Merge branch 'keystone-version-links' into dt-test
Merge branch 'screen-stop' into dt-test
Merge branch 'update-usb-tools' into dt-test