Add Vincent Untz to AUTHORS

Several of my patches are in already.

Change-Id: I0b96f4d262205346e112ec8ac23dd7d5a0f252dd
diff --git a/AUTHORS b/AUTHORS
index 6141d67..ab929ca 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -34,6 +34,7 @@
 Thierry Carrez <thierry@openstack.org>
 Todd Willey <xtoddx@gmail.com>
 Tres Henry <tres@treshenry.net>
+Vincent Untz <vuntz@suse.com>
 Vishvananda Ishaya <vishvananda@gmail.com>
 Yun Mao <yunmao@gmail.com>
 Yong Sheng Gong <gongysh@cn.ibm.com>