Clean out a few warnings on potential resource leakage

utils/src/com/cloud/utils/NumbersUtil.java

@@ -199,25 +199,29 @@ public class NumbersUtil {
     public static String toReadableSize(long bytes) {
         if (bytes <= KB && bytes >= 0) {
             return Long.toString(bytes) + " bytes";
-        } else if (bytes <= MB) {
+        } else if (bytes < MB) {
             StringBuilder builder = new StringBuilder();
             Formatter format = new Formatter(builder);
             format.format("%.2f KB", (float)bytes / (float)KB);
+            format.close();
             return builder.toString();
-        } else if (bytes <= GB) {
+        } else if (bytes < GB) {
             StringBuilder builder = new StringBuilder();
             Formatter format = new Formatter(builder);
             format.format("%.2f MB", (float)bytes / (float)MB);
+            format.close();
             return builder.toString();
-        } else if (bytes <= TB) {
+        } else if (bytes < TB) {
             StringBuilder builder = new StringBuilder();
             Formatter format = new Formatter(builder);
             format.format("%.2f GB", (float)bytes / (float)GB);
+            format.close();
             return builder.toString();
         } else {
             StringBuilder builder = new StringBuilder();
             Formatter format = new Formatter(builder);
             format.format("%.4f TB", (float)bytes / (float)TB);
+            format.close();
             return builder.toString();
         }
     }

utils/test/com/cloud/utils/NumbersUtilTest.java

@@ -0,0 +1,31 @@
+// Licensed to the Apache Software Foundation (ASF) under one
+// or more contributor license agreements.  See the NOTICE file
+// distributed with this work for additional information
+// regarding copyright ownership.  The ASF licenses this file
+// to you under the Apache License, Version 2.0 (the
+// "License"); you may not use this file except in compliance
+// the License.  You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing,
+// software distributed under the License is distributed on an
+// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+// KIND, either express or implied.  See the License for the
+// specific language governing permissions and limitations
+// under the License.
+package com.cloud.utils;
+
+import static org.junit.Assert.*;
+
+import org.junit.Test;
+
+public class NumbersUtilTest {
+
+    @Test
+    public void formattingCheck() {
+        long size = 1024*1024*1024;
+        String formatted = NumbersUtil.toReadableSize(size);
+        assertEquals("1.00 GB", formatted);
+    }
+}