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>
I removed the "status" command and used the getter of the LicenseStatus object to allow the user to check the license status via the "show" command. This also changes the syntax of the show command to allow:
show <TYPE>
and therefore the user can use:
show license_status
to check the license status.