added a listener for name changes in LeaderboardCacheManager, making the two previously failing test cases pass

Change-Id: Ifb0966ba8891aeae68d9d08ff9a3c5e3876badea

java/com.sap.sailing.domain.shared.android/src/com/sap/sailing/domain/base/LeaderboardBase.java

@@ -8,4 +8,8 @@ public interface LeaderboardBase extends Named {
      * this method returns it; otherwise, <code>null</code> is returned.
      */
     String getDisplayName();
+    
+    void addLeaderboardChangeListener(LeaderboardChangeListener listener);
+    
+    void removeLeaderboardChangeListener(LeaderboardChangeListener listener);
 }

java/com.sap.sailing.domain.shared.android/src/com/sap/sailing/domain/base/LeaderboardChangeListener.java

@@ -0,0 +1,6 @@
+package com.sap.sailing.domain.base;
+
+public interface LeaderboardChangeListener {
+    void nameChanged(String oldName, String newName);
+    void displayNameChanged(String oldDisplayName, String newDisplayName);
+}