[Kascade] Bugfix: If the master is not provided, Kascade uses the first node...

[Kascade] Bugfix: If the master is not provided, Kascade uses the first node to detect the local IP.

If the master is not provided when detect_who_i_am function is called, this means that
the node is the master. The detect_who_i_am function is used to detect, if the master is
included in node list.

Change-Id: Iade6f89cff720c95a7e4a07a9905645322140086

addons/kascade/kascade

@@ -231,7 +231,7 @@ def detect_who_i_am
     who = my_list.index(host) if host
   end
   unless who
-    who = my_list.index(local_ip($config[:master]))
+    who = my_list.index(local_ip($config[:master] || $config[:nodeList][0]))
   end
   who
 end