Add version number 3.2.1.

Change-Id: I5c03bc272da7617780ac506d7231f3e49b9513f1
Reviewed-on: https://git-ccr-1.devtools.intel.com/gerrit/40948
Tested-by: webrtctest <[email protected]>
Reviewed-by: Xian, Yuqiang <[email protected]>

Author: jianjunz

peerserver.js

@@ -94,6 +94,7 @@ function authorization(socket, next){
   var clientType=query.clientType;
   switch(clientVersion){
     case '3.2':
+    case '3.2.1':
       // socket.user stores session related information.
       if(token){
         validateUser(token, function(uid){  // Validate user's token successfully.