Support running measurements remotely.

Extend the existing test scripts to allow a test laptop to control a TV
Box over SSH, and gather measurements directly from it. This replaces
ad-hoc testing with something more systematic.

Scripts now depend on Python's Fabric library. To install, run

    $ sudo easy_install pip
    $ sudo pip install fabric

Change-Id: Iec029dee26a9c729528e4f12b89f865537febadc
6 files changed