Merge branch 'bpf-bpftool-probes'

Michal Rostecki says:

====================
Feature probes in bpftool related to bpf_probe_write_user and
bpf_trace_printk helpers emit dmesg warnings which might be confusing
for people running bpftool on production environments. This patch series
addresses that by filtering them out by default and introducing the new
positional argument "full" which enables all available probes.

The main motivation behind those changes is ability the fact that some
probes (for example those related to "trace" or "write_user" helpers)
emit dmesg messages which might be confusing for people who are running
on production environments. For details see the Cilium issue[0].

v1 -> v2:
- Do not expose regex filters to users, keep filtering logic internal,
expose only the "full" option for including probes which emit dmesg
warnings.

v2 -> v3:
- Do not use regex for filtering out probes, use function IDs directly.
- Fix bash completion - in v2 only "prefix" was proposed after "macros",
  "dev" and "kernel" were not.
- Rephrase the man page paragraph, highlight helper function names.
- Remove tests which parse the plain output of bpftool (except the
  header/macros test), focus on testing JSON output instead.
- Add test which compares the output with and without "full" option.

v3 -> v4:
- Use enum to check for helper functions.
- Make selftests compatible with older versions of Python 3.x than 3.7.

  [0] https://github.com/cilium/cilium/issues/10048
====================

Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

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