AbstractContextSource.getUserDn() should be public

Fixes gh-353

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

@@ -497,8 +497,8 @@ public abstract class AbstractContextSource implements BaseLdapPathContextSource
 	 * 
 	 * @return the user distinguished name.
 	 */
-	protected String getUserDn() {
-		return userDn;
+	public String getUserDn() {
+		return this.userDn;
 	}
 
 	/**

core/src/test/java/org/springframework/ldap/core/support/ldap294/Ldap294Tests.java

@@ -42,8 +42,8 @@ public class Ldap294Tests {
 			// Verify a subclass outside of package scope can access password
 			// and userDn since Spring Security needs to be able to access these
 			// properties.
-			String pass = super.password;
-			String userDn = super.userDn;
+			String pass = super.getPassword();
+			String userDn = super.getUserDn();
 			return null;
 		}