Fix the get_name_of_constant to get key from attribute which not begi…

…n with "_"

- Relate to Issue ros#209

actionlib/src/actionlib/action_client.py

@@ -63,7 +63,7 @@
 
 def get_name_of_constant(C, n):
     for k, v in C.__dict__.items():
-        if isinstance(v, int) and v == n:
+        if isinstance(v, int) and v == n and not k.startswith("_"):
             return k
     return "NO_SUCH_STATE_%d" % n