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>
@admytren you're right with regards to being consistent with our design, and I would have done what you suggested myself, but this is definitely not wrong as far as the design is concerned, and we also do proper validation in the server side for this blob.  There's really no right answer in this case, but I don't know the original spec to say that which is preferred.  Let's go with this approach for this API.