MAHOUT-1417: Random decision forest implementation fails in Hadoop 2

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1568726 13f79535-47bb-0310-9956-ffa450edef68
MAHOUT-1417: changed EasyMock.createMock() to EasyMock.createNiceMock() to suppress assertion failure.

git-svn-id: https://svn.apache.org/repos/asf/mahout/trunk@1568731 13f79535-47bb-0310-9956-ffa450edef68