This turns the core of the script into a library function. Ultimately this
will let us call that code with custom 'keywords' rather than relying
on the data parsed from bitbake metadata which can't be used when archiving
historical results.
(From OE-Core rev: 4820ca2b0850e29b04a4fd5659a6e9837d6714d0)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
