undo changes only required for 5.x

Author: jbarrasa

src/main/java/n10s/result/VirtualNode.java

@@ -57,11 +57,6 @@ public long getId() {
     return id;
   }
 
-  @Override
-  public String getElementId()
-  {
-    return String.valueOf( id );
-  }
 
   @Override
   public void delete() {

src/main/java/n10s/result/VirtualRelationship.java

@@ -54,11 +54,6 @@ public long getId() {
     return id;
   }
 
-  @Override
-  public String getElementId()
-  {
-    return String.valueOf( id );
-  }
 
   @Override
   public void delete() {