Investigate any remaining test failures reported from Travis CI.
(No unaddressed failures at the moment).
Old failures that have potentially been fixed now:
https://travis-ci.org/bro/bro/jobs/421789748 scripts.base.frameworks.config.updates
https://travis-ci.org/bro/bro/jobs/418744582 scripts.base.frameworks.logging.field-extension-cluster-error
https://travis-ci.org/bro/bro/jobs/419726875 scripts.base.utils.exec (btest-diff failed)
https://travis-ci.org/bro/bro/jobs/419726877 scripts.base.frameworks.input.invalid-lines (aborted)
https://travis-ci.org/bro/bro/jobs/414719986 scripts.base.frameworks.netcontrol.acld (did not terminate)
https://travis-ci.org/bro/bro/jobs/416425177 scripts.base.frameworks.netcontrol.acld-hook (did not terminate)
https://travis-ci.org/bro/bro/jobs/417466827 scripts.base.frameworks.input.predicatemodifyandreread