Changes with Apache Traffic Server 7.1.6
  #4314 - Remove the ignore_keep_alive method entirely
  #4631 - Fix privilege acquisition to work better with docker
  #4647 - Make documentation build successfull with Python 3
  #4650 - Doc: Repair various format errors.
  #4709 - Backport improvements to sslheaders plugin from master to 7.1.x.
  #4771 - Fixes Clang-Analyzer issue of H2 Dependence Tree
  #4772 - Deals better with Cc: max-age=0
  #4787 - Assert if operations on keep_alive_queue and active_queue are not thread-safe
