bitbake: bitbake: respect force flag in runall and runonly

bitbake: bitbake: respect force flag in runall and runonly

Specifying the force flag will now cause runall and runonly to
invalidate the tasks before running them. This allows a --runall or
--runonly to force the tasks to run, even if they would have otherwise
been skipped, e.g.:

 bitbake -f --runall fetch

Will run all do_fetch tasks even if they wouldn't be necessary (for
example, skipped by setscene)

(Bitbake rev: 71e52d3822016027106f2a2e74b8dfdf20f5dc1e)

Signed-off-by: Joshua Watt <JPEWhacker@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>