Revert "Remove unused argument 'kwargs'"
Revert "Remove unused argument 'kwargs'"

Commit 655beab8a5cddf0071e34a71d9b9c8109542ddb0 changes the interfaces.
Due to this commit at least one of the example scripts
(pb_createDatacenter.py) is not working anymore.

With **kwargs you can pass a dict and the function will set the named
args (or use defaults) and simply ignore unknown.

This reverts commit 655beab8a5cddf0071e34a71d9b9c8109542ddb0.

profitbricks/profitbricks-sdk-python