[google] Zone is a required parameter of machine_types request

Fixes ArgumentError: Missing required parameters: zone when calling get_machine_type
[vcloud_director] Add get_supported_versions request.
Merge pull request #2183 from maestrodev/google-get_machine_type

[google] Zone is a required parameter of machine_types request
Merge pull request #2184 from nosborn/vcloud_director_versions

[vcloud_director] Add get_supported_versions request.