HONEYCOMB-10: jVpp - the new java API. Java code generation

The old japi has two main drawbacks:

* it is not fully generated (requres manual coding for
every new api call that returns data other thanstatus code)

* it is not asynchronous from Java perspective (requires
active wait loops - big overhead due to JNI boundary being
crossed lots of times).

The new api is lightweight (fully generated except for connect,
disconenct and ping) and truly asynchronous (uses callbacks,
utilities that offer java.util.concurrent.Future interface
are also provided).

Change-Id: I531080ef651e8a74f19210490c71d161221ab600
Signed-off-by: Marek Gradzki <mgradzki@cisco.com>
Signed-off-by: Maros Marsalek <mmarsale@cisco.com>
Signed-off-by: Ed Warnicke <eaw@cisco.com>