Further updates to fifo_io regression test:

- Teach fifo_io about kqueue monitoring of fifo file descriptor status,
  and add test cases for kqueue to match existing case for poll and
  select.  Add a new cleanup routine, cleanfifokq(), for use in tests that
  use kqueues.  kqueue_setup() sets up kqueue sessions, and kqueue_status()
  returns file descriptor status.

- Correct a bug in select handling relating to the nfds argument, which
  was incorrect so resulted in select occuring on the wrong file descriptor,
  and possible false positive/negative results.

- Clarify error reporting in one byte write+read tests to distinguish
  errors in the after case from the before case.

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