Stun server should return XOR-MAPPED-ADDRESS/MAPPED-ADDRESS correctly

* Return xor mapped address for RFC5389 compatible client
* fix a typo in function name
* update stunserver unitest case
* update author

Bug: webrtc:10764
Change-Id: I466799744a343508233c18b7c477d2212680392a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/143841
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28421}
diff --git a/AUTHORS b/AUTHORS
index bdd24f3..fbf9353 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -78,6 +78,7 @@
 Jan Grulich <grulja@gmail.com>
 Eike Rathke <erathke@redhat.com>
 Michel Promonet <michel.promonet.1@gmail.com>
+Min Wang <mingewang@gmail.com>
 
 &yet LLC <*@andyet.com>
 Agora IO <*@agora.io>