Comment out surefire plugin in flume-ng.

  - The settings as they are in there don't work in JDK9 due to the removal of the MaxPermSize option.
  - Said settings are already set in the parent pom anyway.


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1597128 13f79535-47bb-0310-9956-ffa450edef68