General btest cleanup

- Use `-b` most everywhere, it will save time.

- Start some intel tests upon the input file being fully read instead of
  at an arbitrary time.

- Improve termination condition for some sumstats/cluster tests.

- Filter uninteresting output from some supervisor tests.

- Test for `notice_policy.log` is no longer needed.

testing/btest/scripts/policy/protocols/http/test-sql-injection-regex.zeek

@@ -1,4 +1,4 @@
-# @TEST-EXEC: zeek %INPUT > output
+# @TEST-EXEC: zeek -b %INPUT > output
 # @TEST-EXEC: btest-diff output
 
 @load protocols/http/detect-sqli