Changes
* Move existing provider and related tests to separate directories `v1`
* Rename public name from `SelectelProvider` to `SelectelProviderLegacy`
* Add `list_zones()` method to support "*" for planning
* Fix SSHFP parsing bug, caused by trailing dot in fingerprint which lead to constant re-update of record
* Move version varible to separate file, since now it is utilized by two providers. Storing it in `__init__.py` causes cycling imports
* Update `script/release` and `setup.py` to parse version from another location
* Update `readme.md` with focus on new provider
New
* Add new `SelectelProvider` class to support v2 API
* Isolate API calls into separate class
* Add tests for SelectelProvider