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/empty-values-hashing.bro

@@ -2,7 +2,7 @@
 # @TEST-EXEC: btest-bg-run bro bro -b %INPUT
 # @TEST-EXEC: sleep 2
 # @TEST-EXEC: cp input2.log input.log
-# @TEST-EXEC: btest-bg-wait -k 5
+# @TEST-EXEC: btest-bg-wait 10
 # @TEST-EXEC: btest-diff out
 
 @TEST-START-FILE input1.log