MidoNet CLI support for license management

Adds the following object types to the CLI:
- License to show the information for a license bean
- LicenseStatus to show the information for the license
  status

Adds the following commands to the CLI:
- Install to allow the installation of a license object
  from a file
- Status to show the status of an object type, such as
  a license

Includes support for a POST method to the MidoNet API,
where the request media type is binary data (octet stream).

Signed-off-by: Alex Bikfalvi <alex.bikfalvi@midokura.com>
Right now, I don't think so. Nevertheless, the issuer is a X.500 principal that must be present in a license file, to validate the license.