If not so, trafficserver configuration is removed and then replaced on
every slapos node instance call making traffic server unstable

  Introduce NGINX on the same partition of apache to handle websocket\
  and eventsource types.

  The NGINX will run on another port and it would require a second ip at
  the machine for enable it.

  This configuration is a working version with fully https support, but
  some additional adjustments might be required.

  Use a single apache server to handle cache and normal apache configurations. With trafficserver,
  the access would follow the model:

    Apache > Traffic Server > Apache 'Cache' > Backend

  Now the configuration changed to:

    Apache > Traffic Server > Apache (same as before) > Backend

  This simplify the amount of apache process to manage on the frontend.

  Use 2 different ports on apache for cached slaves, to differ http and https accesses.
  Introduce the parameter https-url (with fallback to url) to include specific https urls,
    if they are different from url.
  Include /HTTPS/ mapping to traffic server to differ the backends based on the input.

  Not all frontend clusers setup uses the same re6stnet network.

  The promise returns too much data into the PIPE, if it is the case, it makes
  the promise much much slower, causing constant timeout

  The password and username has to be passed to the others instances and used

apache-frontend: Slave with cache now have dedicated virtualhost, add checkProxyCertificate, Strip Via header option

NOTE: If the configuration is wrong the output is null

apache-frontend: ats: add basic cache configuration

XXX RAM (1G) and disk (8G) cache size Should not be hardcoded

apache-frontend: ats: mark in header status of request in ats

apache-frontend: remove squid

apache-frontend: log access, one per slave

apache-frontend: protect log access with password

apache-frontend: slave publish their log-access-url

apache-frontend: publish all log-access urls

apache-frontend: comment md5 for development

apache-frontend: slapos.recipe.cmmi updated

apache-frontend: fix log access

apache-frontend: specify frontend for the log access

apache-frontend: update md5sum

apache-frontend: update versions

apache-frontend: log access, one per slave

apache-frontend: protect log access with password

apache-frontend: slave publish their log-access-url

apache-frontend: publish all log-access urls

apache-frontend: comment md5 for development

apache-frontend: slapos.recipe.cmmi updated

apache-frontend: fix log access

apache-frontend: specify frontend for the log access

apache-frontend: update md5sum

apache-frontend: update versions

Remove squid recipe to offer better reactivity if modification are needed

This reverts commit 8a6c47bc.