Removes unnecessary utf-8 coding

The file was added redundant utf-8 coding by some editor.
we can delete it .

Change-Id: I55cfca58af0985fb54f7f6307d96f99ae10bae35
diff --git a/doc/source/conf.py b/doc/source/conf.py
index 2edaddb..04ddfdf 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -1,5 +1,3 @@
-# -*- coding: utf-8 -*-
-#
 # Tempest documentation build configuration file, created by
 # sphinx-quickstart on Tue May 21 17:43:32 2013.
 #