bitbake: runqueue: Improve inter setscene task dependency handling

The way the code currently handles dependencies between setscene tasks is fairly
poor, basically by deleting chunks of dependencies and adding reversed dependency
relationships.

This was once the best way to handle things but now a lot of the surrounding code
has changed and this approach is suboptimal and can be improved.

This change firstly adds debug logging for "hard" setscene task dependencies since
previously the codepaths were missing from logs making them very hard to read.

The changes to the setscene dependency graph are removed entirely this these altered
graphs were a significant source of problems. Instead, if a hard dependency is run
into, we mark the hard dependency as buildable and defer the task until the hard
dependencies are met.

The code now also skips the check_dependencies() code for hard dependencies since
previously that code was having to list all possible hard dependencies. We don't
need to do that as we can safely assume hard dependencies are required.

With these changes to runqueue's behaviour, we stand some chance of being able to
fix other bugs in OE-Core related to useradd for example.

(Bitbake rev: 367789b53c1c22ec26e0f4836cdf2bdd9c7d84fa)

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

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