test: run cpplint on files in test/cctest

Enable cpplint for files in test/cctest.  Fix up the style issues it
reports.

PR-URL: https://github.com/nodejs/node/pull/9787


Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Sakthipriyan Vairamani <thechargingvolcano@gmail.com>