test_vendor: Add base implementation

test_vendor: Add Device and Beacon classes
Device contains properties to be modeled.  Beacon
is a simple class that inherits from Device.

test_vendor: Add a Device factory
The device factory calls the constructors and initializes
the devices.  The controller uses the factory to instantiate
devices.

test_vendor: Add a Keyboard class
Add a connectable LE device.

test_vendor: Add BrokenAdv device
Generate random broken advertisements.

test_vendor: Add scanning and connections
Add a connection class to handle data transfer.
Add scanning and connections in the controller.

Test: Compiles
Change-Id: Id9f64308447c9de4e83a2a4fa9f59c30bede75ab