HBASE-23246 Fix error prone warning in TestMetricsUserSourceImpl (#789)

Signed-off-by: Sean Busbey <busbey@apache.org>
Signed-off-by: Guangxu Cheng <guangxucheng@gmail.com>

Author: apurtell

hbase-hadoop2-compat/src/test/java/org/apache/hadoop/hbase/regionserver/TestMetricsUserSourceImpl.java

@@ -47,10 +47,8 @@ public void testCompareToHashCodeEquals() throws Exception {
     assertTrue(one.compareTo(two) != 0);
     assertTrue(two.compareTo(one) != 0);
     assertTrue(two.compareTo(one) != one.compareTo(two));
-    assertTrue(two.compareTo(two) == 0);
   }
 
-
   @Test (expected = RuntimeException.class)
   public void testNoGetRegionServerMetricsSourceImpl() throws Exception {
     // This should throw an exception because MetricsUserSourceImpl should only