Fix fail of vRouter on Orange POD

Fix fail of vRouter on Orange POD

1. Functest docker container environment has no attribute 'OS_REGION_NAME'
2. vRouter was get the 'OS_REGION_NAME' but not used it.
3. Deleting use 'OS_REGION_NAME' part of vRouter.
4. Utility lib of vRouter use Nova client.
5. Modifying Nova client authentication step for auth api v3.
6. Doing test of modified vRouter on Orange POD.

Change-Id: I062549e5ca48fb4825b53448a4e2ffc8c1f8ec40
Signed-off-by: root <shuya.nakama@okinawaopenlabs.org>
(cherry picked from commit 3fa62219bb5a9e928fe94d95314c7c00d5f06e66)