Modify comment which does not conform to code

  The content of the comment does not match the actual code.Modify
it.

Change-Id: Ia07024c5d26c29b3ea004a1029c76c33b426b447
diff --git a/tempest/lib/common/utils/data_utils.py b/tempest/lib/common/utils/data_utils.py
index 7fcec8c..93382c0 100644
--- a/tempest/lib/common/utils/data_utils.py
+++ b/tempest/lib/common/utils/data_utils.py
@@ -47,8 +47,8 @@
     :param str name: The name that you want to include
     :param str prefix: The prefix that you want to include
     :return: a random name. The format is
-             '<prefix>-<random number>-<name>-<random number>'.
-             (e.g. 'prefixfoo-1308607012-namebar-154876201')
+             '<prefix>-<name>-<random number>'.
+             (e.g. 'prefixfoo-namebar-154876201')
     :rtype: string
     """
     randbits = str(random.randint(1, 0x7fffffff))