bitbake: build/data: Write out more complete python run files

bitbake: build/data: Write out more complete python run files

Currently the output in the python task/function run files is rather
incomplete and effectively useless. This enhances the code to take
advantage of the bitbake's dependency tracking and extend the output to
include dependencies. This makes the files more usable for debugging
purposes. Since this only happens at python function execution time, the
overhead is minimal in the grand scheme of things.

(Bitbake rev: 02667e048c3e632f857c87177c0022eaf5481802)

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>