sstate: Implement a setscene dependency validation routine to allow skipping of some sstate installation

This is a first attempt at logic to determine when a sstate dependency needs
to be installed and when it does not. Its a start at the logic and errs on the
side of caution, as it gets wider testing, we can refine the logic as needed.

This code should allow a significant performance speedup to certain workflows, for
example "bitbake xxx-image -c rootfs" will not populate the target sysroot.

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

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