Improve adherence to python coding standards and clear up IDE static analysis warnings

spothole.py

@@ -32,12 +32,12 @@ def shutdown(sig, frame):
 
     logging.info("Stopping program...")
     web_server.stop()
-    for p in spot_providers:
-        if p.enabled:
-            p.stop()
-    for p in alert_providers:
-        if p.enabled:
-            p.stop()
+    for sp in spot_providers:
+        if sp.enabled:
+            sp.stop()
+    for ap in alert_providers:
+        if ap.enabled:
+            ap.stop()
     cleanup_timer.stop()
     lookup_helper.stop()
     spots.close()