* Support for kernel up to 5.15
  * bcc tools: update for kvmexit.py, tcpv4connect.py, cachetop.py, cachestat.py, etc.
  * libbpf tools: update for update for mountsnoop, ksnoop, gethostlatency, etc.
  * fix renaming of task_struct->state
  * get pid namespace properly for a number of tools
  * initial work for more libbpf utilization (less section names)
  * doc update, bug fixes and other tools improvement

Signed-off-by: Yonghong Song <[email protected]>