bitbake: siggen: Improve runtaskdeps data to fix sstate debugging

The runtaskdep data in siginfo files was written out with full paths to
the bb files, matching bitbake's internal "unique key" ID for recipes/tasks.
When originally implemented this made sense.

Over time, the main use for the data in siginfo files has become to match
against other siginfo files to debug changes of hash calcuations. The
recipename data is not useful for this as the siginfo filenames use PN
instead which can often be derived from the recipe filename but not always.

It is time to throw away the 'tid' data format and switch over the use a
hybrid PN form which includes the multiconfig. That can be easily stripped
off in the find_siginfo code in oe-core.

The other purpose of having a sortable dependency ID is retained and the
multiconfig needs to be included to allow the taskhashes to be processed
and calculated correctly. PN is meant to be unique between recipes, only
one would ever be built so using PN in this location is fine.

The one risk of this change is there isn't any compatibility to the old
format. I'm not convinced we should spend time complicating the code
with it. This change will change the taskhashes everywhere so the only
mixing of old and new siginfo files will be either through hash equivalence
or through users using the tool against old and new info files manually
which will give some weird output but it should be clear they're in
different formats as there would be large paths from the old files not
present in the new ones.

We have options to add backwards compatibility if some issue is found
to need that.

(Bitbake rev: 637933e2e5a59228a8d17aae4160551cab5f2f61)

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

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