Add MAC address to the documentation for lava-network.
Add MAC address to the documentation for lava-network.

Change-Id: I70da3ecef933d15846cc82890db92586a773e182
Reviewed-on: https://review.linaro.org/683
Reviewed-by: Wei Fu <576d3febf541ee4ce3646aeb9fa928d8981d091c@linaro.org>

OSSystems/lava-server,OSSystems/lava-server,OSSystems/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server,Linaro/lava-server