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