- update to 1.6.3:
* Revert "Use the correct auth_plugin for token authentication"
* Ignore infra CI env vars
* Use the correct auth_plugin for token authentication
* Align to generic password auth-type
* Clarify floating ip use for vendors
* Add per-service endpoint overrides
* Remove requirements.txt from tox.ini
* Remove py26 and py33 from tox.ini
* Rename 'endpoint_type' to 'interface'
* Have service name default to None
* Remove region list from single cloud
* Fix set_default() when used before config init
* Specify the config file with environment variable
* Add support for configuring region lists with yaml
* Fix rendering issue in Readme
* Clean up vendor data
* Add support for indicating preference for IPv6
* Normalize project_name aliases