requests should respect no_proxy env variable (#4867)

If you want to specify a no_proxy variable in your dockerfile or docker-compose.yml, then this little fix respects the variable in get-requests. Otherwise the proxies could break your docker namespace lookup.

dashboard/django/collector.py

@@ -461,7 +461,7 @@ if __name__ == "__main__":
         logger.info(http_headers)
 
     global http_proxyes
-    http_proxyes = {}
+    http_proxyes = { "no_proxy": os.getenv("NO_PROXY", "") }
     if args.proxy:
         http_proxyes['http'] = args.proxy
         http_proxyes['https'] = args.proxy