bitbake: runqueue: Allow partial setscene task coverage

When the setscene code was originally written it was thought that we'd
allow "partial" coverage. For example, if we just want to build the target
"bash:do_populate_sysroot" and its available from sstate, it makes no sense
to install gcc-cross's sstate package as its simply not needed.

Due to various other issues in the codebase, this functionality was
disabled/removed to allow the setscene code and sstate to stabilise and allow
us to concentrate on other problems.

The time has now come to enable "partial" coverage. There are two major changes
in this patch:

a) Creation of an unskippable list. This lists direct dependencies of
   build targets and hence things that cannot be skipped.

b) Addition of a handler which looks at a given setscene target and what depends
   on it and then decides whether its necessary.

(Bitbake rev: 2a937cd6a6c3110030b40bc4d85e349b85cb4db7)

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

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