use relative path in umask unit test

Author: rootfs

src/test/java/org/apache/hadoop/fs/test/unit/HcfsUmaskTest.java

@@ -70,7 +70,7 @@ public void tearDown() throws Exception {
     public void testMkdirsWithUmask() throws Exception {
         Configuration conf = fs.getConf();
         String oldUmask = conf.get("fs.permissions.umask-mode");
-        Path dir = new Path("/dirUmask022");
+        Path dir = new Path("dirUmask022");
         conf.set("fs.permissions.umask-mode", "022");
         assertTrue(fs.mkdirs(dir));
         conf.set("fs.permissions.umask-mode", oldUmask);