CLI: fixes in Route class definition

  * Make type an enum
  * Make port a PortRef instead of an ObjectRef.
  * Fix the alias prefix, was: router, is: route

Fixes #32

Signed-off-by: Guillermo Ontanon <guillermo@midokura.jp>
Merge pull request #34 from gontanon/m/gh32

CLI: fixes in Route class definition