return the processed context (as it can be a proxy)

Author: Amir Wiener

core/src/main/java/org/springframework/ldap/core/support/AbstractContextSource.java

@@ -139,8 +139,8 @@ private DirContext doGetContext(String principal, String credentials, boolean ex
         DirContext ctx = createContext(env);
 
         try {
-            authenticationStrategy.processContextAfterCreation(ctx, principal, credentials);
-            return ctx;
+            DirContext processedDirContext = authenticationStrategy.processContextAfterCreation(ctx, principal, credentials);
+            return processedDirContext;
         }
         catch (NamingException e) {
             closeContext(ctx);