Disabled maven site plugin for buildtools module

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1500210 13f79535-47bb-0310-9956-ffa450edef68
Moved findbugs configuration from sourcechecks profile to default configuration, so that same configuration gets used on ad-hoc findbugs:findbugs runs, like one in MahoutQuality build job

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1500215 13f79535-47bb-0310-9956-ffa450edef68
Configured tests to run sequentially, without any parallelization, forking separate JVM for each test, without reusing forks; this will be very slow, but recent build instability is likely caused by some tests not being able to run in parallel

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1500216 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-833: removed code comment.

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1500310 13f79535-47bb-0310-9956-ffa450edef68