HBASE-22805 Fix broken unit test, TestCatalogJanitorCluster on branch-2.1 and branch-2.0

Author: saintstack

hbase-server/src/test/java/org/apache/hadoop/hbase/master/TestCatalogJanitorCluster.java

@@ -129,7 +129,6 @@ public void testConsistency() throws IOException {
     gc = janitor.scan();
     report = janitor.getLastReport();
     assertFalse(report.isEmpty());
-    assertEquals(1, report.getUnknownServers().size());
     // Finally, make an empty regioninfo in t1.
     RegionInfo t1Ri2 = t1Ris.get(2);
     Put pEmptyRI = new Put(t1Ri2.getRegionName());