Refactor argument handling in db_crashtest.py

[ajkr]

• Any options unknown to db_crashtest.py are now passed directly to db_stress. This way, we won't need to update db_crashtest.py every time db_stress gets a new option.
• Remove db_crashtest.py redundant arguments where the value is the same as db_stress's default
• Remove db_crashtest.py redundant arguments where the value is the same in a previously applied options map. For example, default_params are always applied before whitebox_default_params, so if they require the same value for an argument, that value only needs to be provided in default_params.
• Made the simple option maps applied in addition to the regular option maps. Previously they were exclusive which led to lots of duplication

Test Plan:

TEST_TMPDIR=/dev/shm/rocksdb OPT=-g make J=1 crash_test

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[ajkr]

unassigning myself because I can't review my own PR and (I guess) having it assigned will make others less likely to look.

[anand1976]

LGTM

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@ajkr is landing this pull request. If you are a Facebook employee, you can view this diff on Phabricator.