Add cachechecker for check http cache of a site

  This tool was originally released at http://git.erp5.org/gitweb/erp5.git/tree/HEAD:/erp5/util/webchecker?js=1 and modified by Romain Courteau later them.

setup.py

@@ -85,7 +85,8 @@ setup(name=name,
           'slaprunnertest = slapos.runner.runnertest:main',
           'slaprunnerteststandalone = slapos.runner.runnertest:runStandaloneUnitTest',
           'zodbpack = slapos.zodbpack:run [zodbpack]',
-          'networkbench = slapos.networkbench:main'
+          'networkbench = slapos.networkbench:main',
+          'cachechecker = slapos.cachechecker:web_checker_utility'
         ]
       },
       test_suite='slapos.test',

slapos/README.cachecheacker.rst

+HTTP Cache Checker
+==================
+
+Crawl a website and check the HTTP configuration.
+
+Run
+===
+
+    python2 cachechecker.py -o result.txt cachechecker.conf
+
+
+Example of configuration
+========================
+
+::
+
+    [web_checker]
+    url = http://example.org
+    
+    working_directory = /tmp/cachechecker
+    
+    # debug_level = info
+    debug_level = debug
+    file_log_path = /tmp/cachechecker.log
+    
+    # http://labs.omniti.com/people/mark/ats_sa/slides.html#slide-18
+    traffic_server_cache = cHs
+      cSsNfU
+    
+    [header_list]
+    Last-Modified = True
+    Expires = True
+    Vary = Cookie,Authorization,Accept-Encoding
+    Cache-Control = max-age=600, stale-while-revalidate=360000, public
+    
+    [no_header url=.*]
+    Set-Cookie = None
+    
+    [no_header content-type=(image/.*|application/vnd.ms-fontobject|application/x-font-woff|font/truetype)]
+    Vary = None
+    
+    [header content-type=image/.*]
+    Cache-Control = max-age=3600, stale-if-error=360000, stale-while-revalidate=360000, public
+    
+    [header content-type=(text/css|text/plain|application/x-javascript|.*/javascript|application/vnd.ms-fontobject|application/x-font-woff|font/truetype)]
+    Vary = Accept-Encoding
+    Cache-Control = max-age=3600, stale-if-error=360000, stale-while-revalidate=360000, public
+    
+    # Captcha
+    [header url=(.*/contactus$)]
+    Cache-Control = max-age=0, no-cache
+    
+    # # IE PDF Bug
+    [header url=.*format=pdf]
+    Cache-Control = Private
+    
+    [header url=.*format=]
+    Vary = Cookie,Authorization,Accept-Encoding
+    Cache-Control = max-age=600, stale-while-revalidate=360000, public
+    
+    [erp5_extension_list]
+    prohibited_folder_name_list = web_page_module
+      document_module
+      web_site_module
+    prohibited_file_name_list = WebSection_viewAsWeb
+      Base_viewHistory
+      Base_download
+      list