Updates related to the app's name and its docker file

Change-Id: If24c36cd8460be20978236b95547f6a6e03fd84a
diff --git a/network-diag-app.py b/network-diag-app.py
index 86d564f..78e74d5 100644
--- a/network-diag-app.py
+++ b/network-diag-app.py
@@ -133,7 +133,7 @@
 
 
 def do_probe(devices):
-    for imsi_id, device in devices.items():
+    for _, device in devices.items():
         if device.ip is None:
             continue
         if ping(device.ip):