Hardware Packs v2

Hey there

As a result of a series of bugs around linaro-image-tools and daily images, it seemed a sensible approach to solve this class of issues would be to move more data into hardware packs rather than hardcoding stuff in linaro-image-tools.

Guilherme, Steve Langasek, and Michael Hudson were all interested in the idea, so Michael convinced me to start a wiki page with some notes: https://wiki.linaro.org/Platform/Specs/11.05/HardwarePacksV2

I'm sending this for others to get the chance to raise issues with hwpacks since we don't want to change the format too frequently.

Cheers,