add apt cache test, refs #20589

tests/test_apt_proxy.py

+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+# Copyright 2017, Florent Thiery
+'''
+Criticality: Normal
+Checks that packages mirror works for capture systems 
+'''
+import os
+import sys
+import requests
+import imp
+
+GREEN = '\033[92m'
+RED = '\033[91m'
+DEF = '\033[0m'
+
+os.chdir(os.path.dirname(__file__))
+if not os.path.isfile('../utils.py'):
+    print('conf.sh not found')
+    sys.exit(1)
+
+es_utils = imp.load_source('es_utils', '../utils.py')
+conf = es_utils.load_conf()
+
+all_ok = True
+
+conf_servers = (
+    'CM_SERVER_NAME',
+)
+
+for s in conf_servers:
+    v = conf.get(s)
+    try:
+        url = "https://%s/old-releases.ubuntu.com/ubuntu/dists/lucid/Release.gpg" % v
+        print('Checking url certificate %s' % url)
+        d = requests.get(url, verify=False)
+        if not "BEGIN PGP SIGNATURE" in d:
+            all_ok = False
+            print('Unexpected content: %s' % d)
+    except Exception:
+        print('Package mirror not working')
+        all_ok = False
+
+sys.exit(int(not all_ok))