Refactored K-Means and Dirichlet to use ClusterClassificationDriver.

I plan to commit this in a day or two. Please suggest if you see any concern.

The patch is also uploaded on the review board.

Integrated in Mahout-Quality #1397 (See https://builds.apache.org/job/Mahout-Quality/1397/)
MAHOUT-981, MAHOUT-983. Refactored K-Means Clustering and Dirichlet Clustering to use ClusterClassificationDriver.
Using cluster.getModel().configure() in ClusterClassificationDriver in order to configure DirichletCluster for MahalanobisDistanceMeasure.
Added/fixed test cases by:
Using separate directories in test cases for supplying initial clusters and to store buildClusters to prevent two cluster-*-final files in the same directory.
Writing IntWritable in test cases instead of LongWritable ( As the ClusterClassificationDriver clusters records with IntWritable keys). (Revision 1301654)

Result = FAILURE
pranjan : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1301654
Files :

• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/classify/ClusterClassificationDriver.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/classify/ClusterClassificationMapper.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/dirichlet/DirichletClusterMapper.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/dirichlet/DirichletClusterer.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/dirichlet/DirichletDriver.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/iterator/DirichletClusteringPolicy.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/kmeans/KMeansClusterMapper.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/kmeans/KMeansClusterer.java
• /mahout/trunk/core/src/main/java/org/apache/mahout/clustering/kmeans/KMeansDriver.java
• /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/canopy/TestCanopyCreation.java
• /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/classify/ClusterClassificationDriverTest.java
• /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/dirichlet/TestDirichletClustering.java
• /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/dirichlet/TestMapReduce.java
• /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/kmeans/TestKmeansClustering.java
• /mahout/trunk/integration/src/test/java/org/apache/mahout/clustering/TestClusterEvaluator.java
• /mahout/trunk/integration/src/test/java/org/apache/mahout/clustering/cdbw/TestCDbwEvaluator.java

Integrated in Mahout-Quality #1398 (See https://builds.apache.org/job/Mahout-Quality/1398/)
MAHOUT-981, MAHOUT-983. Fixing test cases which fail intermittently.
Build is passing on my machine ( even for the last commit ).
Tried to identify all test cases, which can fail intermittently and fixed them. (Revision 1301761)

Result = SUCCESS
pranjan : http://svn.apache.org/viewcvs.cgi/?root=Apache-SVN&view=rev&rev=1301761
Files :

• /mahout/trunk/core/src/test/java/org/apache/mahout/clustering/kmeans/TestKmeansClustering.java
• /mahout/trunk/integration/src/test/java/org/apache/mahout/clustering/TestClusterDumper.java

Refactored clustering out of DirichletDriver using ClusterClassificationDriver. Dirichlet was already having a threshold option. So, the issue has been developed completely now.
Resolving the issue.