- ece list-deployments now displays all the deployments for the given
  ECE instance.
- added significant cleaning of the HTTP headers before Varnish hits
  the backend (i.e. ECE):

 We now remove all request headers before hitting the backend, except:

   - Host
   - User-Agent
   - X-Forwarded-For
   - Referer
   - Accept
   - X-OperaMini-Phone-UA

 The reason for this, is that we're optimising the device detection
 through the use of buckets. Hence, we must remove all headers that
 backend software (such as Mobiletech) may use to determine the client
 and by that deliver web content.
- fixed a bug in common-bashing::green where the screen would be
  cleared at the end of each call (the background for the bummer, was
  to reset the SHELL environment after issuing BASH escapes).

- introduced more local variables in
  ece-install::print_status_and_next_steps to "bleed" less variables.