OF-582 Changed synchronization to user_name+property_name

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@13331 b35dd754-fafc-0310-a699-88a17e54d16e

src/java/org/jivesoftware/openfire/user/User.java

@@ -436,7 +436,7 @@ public class User implements Cacheable, Externalizable, Result {
             Map<String,Object> eventParams = new HashMap<String,Object>();
             Object answer;
             String keyString = (String) key;
-            synchronized (keyString.intern()) {
+            synchronized (getName() + keyString.intern()) {
                 if (properties.containsKey(keyString)) {
                     String originalValue = properties.get(keyString);
                     answer = properties.put(keyString, (String)value);