Add a filter subcommand to filter a task-depends.dot graph produced by
bitbake -g down to just a subset of targets/tasks.
(From OE-Core rev: a14b274b56676ff0ba55a4048169ad60c9514994)
Signed-off-by: Paul Eggleton <paul.eggleton@linux.microsoft.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>