docs: def upgrade_packages():
      """
      apt-get update and apt-get upgrade
      """
      if env.verbosity:
          print env.host, "apt-get UPDATING and UPGRADING SERVER PACKAGES"
          print " * running apt-get update "
      sudo('apt-get -qqy update')
      if env.verbosity:
          print " * running apt-get upgrade"
          print " NOTE: apt-get upgrade has been known in rare cases to require user input."
          print "If apt-get upgrade does not complete within 15 minutes"
          print "see troubleshooting docs *before* aborting the process to avoid package management corruption."
      sudo('apt-get -qqy upgrade')