fixed non-idempotent unit tests

Author: kaiyaok2

asynchbase/src/test/java/site/ycsb/db/AsyncHBaseTest.java

@@ -121,6 +121,7 @@ public void setUp() throws Exception {
   public void tearDown() throws Exception {
     table.close();
     testingUtil.deleteTable(tableName);
+    client.cleanup(); 
   }
 
   @Test

hbase1/src/test/java/site/ycsb/db/hbase1/HBaseClient1Test.java

@@ -120,6 +120,7 @@ public void setUp() throws Exception {
   public void tearDown() throws Exception {
     table.close();
     testingUtil.deleteTable(tableName);
+    client.cleanup();
   }
 
   @Test

hbase2/src/test/java/site/ycsb/db/hbase2/HBaseClient2Test.java

@@ -123,6 +123,7 @@ public void setUp(Properties p) throws Exception {
   public void tearDown() throws Exception {
     table.close();
     testingUtil.deleteTable(TableName.valueOf(tableName));
+    client.cleanup();
   }
 
   @Test