As the code stands today its hard to know which configuration variables
are used by which parts of the system. Some are used by the UIs, some
by bin/bitbake itself, some by cooker.
This patch changes the configuration to just contain the variables cooker
uses, and changes bin/bitbake to access the variables it needs directly
which hopefully lets us start to untangle this mess.
(Bitbake rev: e57497a24b6157c92519a34accd66035a39ad1f8)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>