* Support for kernel up to 5.16
  * bcc tools: update for trace.py, sslsniff.py, tcptop.py, hardirqs.py, etc.
  * new libbpf tools: bashreadline
  * allow specify wakeup_events for perf buffer
  * support BPF_MAP_TYPE_{INODE, TASK}_STORAGE maps
  * remove all deprecated libbpf function usage
  * remove P4/B language support
  * major test infra change, using github actions now
  * doc update, bug fixes and other tools improvement

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