Fix minor unit test failures:

- MiniSeedInputClient expects a stream as input, not a trace
  (like RawInputClient), and unit tests were designed around this;
  I reverted _put_channel() to its original design, which sends an
  entire stream instead of one trace at a time.
- I forgot to include a tiny change to RawInputClient_test that was
  part of the original (abandoned) MR
- I also made the read client timeout configurable