Fix a couple of warnings on Java 9

Author: acogoluegnes

src/test/java/com/rabbitmq/client/test/ClonePropertiesTest.java

@@ -38,7 +38,7 @@ public class ClonePropertiesTest {
         assertEquals(MessageProperties.MINIMAL_PERSISTENT_BASIC.getDeliveryMode(),
             ((BasicProperties) MessageProperties.MINIMAL_PERSISTENT_BASIC.clone())
                 .getDeliveryMode());
-        assertEquals(new Integer(2),
+        assertEquals(Integer.valueOf(2),
             ((BasicProperties) MessageProperties.MINIMAL_PERSISTENT_BASIC.clone())
                 .getDeliveryMode());
     }

src/test/java/com/rabbitmq/client/test/ValueOrExceptionTest.java

@@ -38,7 +38,7 @@ public InsufficientMagicException sensibleClone() {
     }
 
     @Test public void storesValue() throws InsufficientMagicException {
-        Integer value = new Integer(3);
+        Integer value = Integer.valueOf(3);
 
         ValueOrException<Integer, InsufficientMagicException> valueOrEx = 
             ValueOrException.makeValue(value);

src/test/java/com/rabbitmq/client/test/functional/Tables.java

@@ -45,7 +45,7 @@ public class Tables extends BrokerTestCase
         Map<String, Object> subTable = new HashMap<String, Object>();
         subTable.put("key", 1);
         table.put("S", LongStringHelper.asLongString("string"));
-        table.put("I", new Integer(1));
+        table.put("I", Integer.valueOf(1));
         table.put("D", new BigDecimal("1.1"));
         table.put("T", new java.util.Date(1000000));
         table.put("F", subTable);