Input framework unit test adjustments.

- Generally increased the time allowed before they timeout.

- For tests w/ a clear termination condition (most of them), made
  timeouts result in a test failure.

- Seemed to be a race in some cases between tests generating output and
  the input reader stream getting removed/closed, so moved stream removal
  closer to termination time, when all output should be available.

testing/btest/scripts/base/frameworks/input/missing-file.bro

@@ -23,5 +23,4 @@ event bro_init()
 	try = 0;
 	outfile = open("../out");
 	Input::add_event([$source="does-not-exist.dat", $name="input", $fields=Val, $ev=line, $want_record=F]);
-	Input::remove("input");
 	}