Release 0.4.1

The "config-drive" parameter to node-set-provision-state, which was introduced
in 0.4.0, was mistakenly named "--configdrive" in the CLI and thereby did not
function. This change corrects the option name to be "--config-drive".

This release also contains the following minor enhancements:
- CLI was not honoring the env[OS_ENDPOINT] variable or --os-endpoint
  command-line parameter.
- port-list command did not support "--address" option, even though the REST
  API has had support for this.
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