HBASE-17326 Fix findbugs warning in BufferedMutatorParams Fix above and the other hbase-server findbugs complaint about null-check

hbase-client/src/main/java/org/apache/hadoop/hbase/client/BufferedMutatorParams.java

@@ -30,7 +30,7 @@ import org.apache.hadoop.hbase.classification.InterfaceStability;
  */
 @InterfaceAudience.Public
 @InterfaceStability.Evolving
-public class BufferedMutatorParams {
+public class BufferedMutatorParams implements Cloneable {
 
   static final int UNSET = -1;
 

hbase-server/src/main/java/org/apache/hadoop/hbase/mapreduce/CellCounter.java

@@ -131,6 +131,8 @@ public class CellCounter extends Configured implements Tool {
      */
 
     @Override
+    @edu.umd.cs.findbugs.annotations.SuppressWarnings(value="NP_NULL_ON_SOME_PATH",
+      justification="Findbugs is blind to the Precondition null check")
     public void map(ImmutableBytesWritable row, Result values,
                     Context context)
         throws IOException {