tune parallel test

This patch contains the fowllowing hacks:

(1) Add "--timetable-data=FILE" option for test-all
    This option enables to dump timeline event
    contains worker, suite, and start/end time.
(2) remove TestJIT in test_jit_debug.rb on parallel test.
    it is duplicated test.
(3) move test_jit.rb and test_jit_debug.rb at first
    because these two tests are bottleneck of parallel tests.

On my environment, `make test-all TESTS=-j12` reduced the total time
190 seconds -> 140 seconds.

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