FLUME-758: Test Excludes on maven build doesn't always work
FLUME-758: Test Excludes on maven build doesn't always work

Surefire 2.8.1 does not allow for lists of excluded tests to be specified via command line.
We force the build to use surefire 2.6 which does.

Verions 2.9, 2.8, 2.7.2, 2.7.1 and 2.7 were also tested and they failed to exclude.

git-svn-id: a99f83eed5fb73f0a29a082c88d77cd96cb68678@1165464 13f79535-47bb-0310-9956-ffa450edef68

tinawenqiao/flume,szaboferee/flume,lfzCarlosC/test,tinawenqiao/flume,szaboferee/flume,lfzCarlosC/test,lfzCarlosC/test,iaiengxia/flume,tmgstevens/flume,lfzCarlosC/test,tmgstevens/flume,iaiengxia/flume,tmgstevens/flume,tinawenqiao/flume,szaboferee/flume,iaiengxia/flume,tmgstevens/flume,szaboferee/flume,iaiengxia/flume,tinawenqiao/flume