Add Bus ID to USB Address Column

USB Addresses are now in the format of: bus_id.device_address.endpoint
This makes it much easier to read traces that captured traffic on
more than one bus.

Change-Id: I264db2ceea712d94632d5d08d05d3af22a4a03fe
Reviewed-on: https://code.wireshark.org/review/2833
Reviewed-by: Evan Huus <eapache@gmail.com>