- This allows us to delegate all 2.0 authentication directly to the
library without reimplementing ourselves.
- Support reusing a token / storage-url without re-authenticating every
time via the switch os_storage_url os_auth_token.
- Allow auth via tenant_id instead of just tenant_name via the switch
os_tenant_id.
- Refactor a bit to make it easier in the future to add new OS features
(i.e: region).
- Implements blueprint use-keystoneclient-for-swiftclient.
- Fixes bug 1016641.
Change-Id: I532f38a68af884de25326aaac05a2050f5ffa1c7