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concurrent.BulkForkAndCall(func, arg_tuples) calls |func()| with
arguments given by |arg_tuples|, which stores arguments over
independent forked calls as a list of tuples. Previously this requires
common parameters (e.g., tool_prefix) to be present in each tuple, and
decreases flexibility for |arg_tuples| preparation code.

This CL adds |kwargs| parameter to BulkForkAndCall(), thereby allowing
common parameters to be given once. As seen in the test changes, a
minor caveat is that |func()| will need to make common parameters
appear at end of argument list.

Bug: 723798
Change-Id: I9aa91b6081b8fe8fa9c87a9ae1cb959d3f17e9df
Reviewed-on: https://chromium-review.googlesource.com/1135204
Commit-Queue: Samuel Huang <huangs@chromium.org>
Reviewed-by: agrieve <agrieve@chromium.org>
Cr-Commit-Position: refs/heads/master@{#574934}