update to debian 9

Dockerfile

@@ -1,9 +1,10 @@
-FROM debian8_python3
+FROM debian:9
 
 MAINTAINER Joachim Lusiardi
 
 RUN apt-get update; \
     apt-get install -y \
+        python3-pip \
         git \
         haproxy; \
     git clone https://github.com/letsencrypt/letsencrypt ;\

start.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3.4
+#!/usr/bin/env python3
 
 import os
 import json
@@ -147,7 +147,6 @@ def cert_watcher():
     ssl_active = ssl_possible() and is_haproxy_running()
     cert_file_hash = hash_cert_file()
     while True:
-        logging.info('ping')
         time.sleep(delay)
 
         if not ssl_active: