QoS API extension support

implements bp qos-api-client

Change-Id: I6ed61f063fd55ad4a5b491c2d31b76e1c32a0ea7
Add Update and Delete commands for QoS

Change-Id: I495589504ba6b0848b63aca1e3a02efa2c0af7d4
Parse the policies CLI arg properly

Change-Id: I3180ae1e845f6a236011fc4a3f18a3710a46f442