Try to handle the dumpster fire called constraint.c a bit better.

The imsg handling in here is not quite right. It works but more by luck.
- use imsgbuf_read_one (similar code as found in a few other places)
  to read the one message we expect.
- do not call imsgbuf_flush() without a child running to read the data.
  With large enough requests imsgbuf_flush() may be locked forever since
  there is no reader on the other side of the pipe.

OK tb@

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