separate serial_schedule useful?

I noticed that the test "hash_func" was listed in parallel_schedule but
not in serial_schedule.  I have seen that a few times recently where a
patch proposes to add a new test file but forgets to add it to the
serial_schedule.

I wonder whether it's still useful to keep two separate test lists.  I
think we could just replace make installcheck with what make
installcheck-parallel MAX_CONNECTIONS=1 does.  Thoughts?

-- 
Peter Eisentraut              http://www.2ndQuadrant.com/
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