api: Re-add deleted addProxyObject method on CloudException

- This was removed part of the response work
- Re-adding as this kind of method definition is available in several other
  exception classes and is used in a lot of cmd classes and in service layer
- TODO: We need to find a way to replace old code and refactor method with the
  new definition that gets only uuid.
- FIXME: Some tables don't have uuid for ex. ClusterVSMMapVO, in this case
  we should keep the method until we find a way to fix this issue

Partially reverting a88ce6bb7f495dddeb954d1fc7826176646b3590

Signed-off-by: Rohit Yadav <bhaisaab@apache.org>

api/src/com/cloud/exception/CloudException.java

@@ -56,6 +56,15 @@ public class CloudException extends Exception {
 		return;
 	}
 
+    public void addProxyObject(Object voObj, Long id, String idFieldName) {
+       // Get the VO object's table name.
+       String tablename = AnnotationHelper.getTableName(voObj);
+       if (tablename != null) {
+               addProxyObject(tablename, id, idFieldName);
+       }
+       return;
+    }
+
 	public ArrayList<String> getIdProxyList() {
 		return idList;
 	}