Integrate platforms and use docker

- Simplify the system by allowing use cases to be run directly from
boot.sh.

- Integrate the management of both aemfvp-a platforms into a single
script and location.

- Change the system to run FVP's in docker containers. This simplifies
the operation of the system for the user, reducing the possibility of
installation errors and allows the exact environment to be shared
between the user system and the test.

Signed-off-by: Ben Taylor <ben.taylor@linaro.org>
Change-Id: Idc1843cef51d47402f8541d5c65b0b990c0b8917