Accommodate v2 and v3 auth for integration tests

devstack has moved default Keystone API version to v3[1].

[1] https://github.com/openstack-dev/devstack/commit/f4ce44bf3fbf06e53c2ae3ec6aa4996831cf4605

Though the above patch has been reverted, this would help
if devstack removes v2 support in the future.

Change-Id: I393750d00b3712a015e48a3cf38ab5f95bb61dae
Closes-Bug: #1539692
5 files changed
tree: d557e18d8afd0f74e4caf2dd24aba327810eda78
  1. common/
  2. functional/
  3. scenario/