Merge branch 'bpf-bpftool-queue-stack'

Stanislav Fomichev says:

====================
This patch series add support for queue/stack manipulations.

It goes like this:

   commands by permitting empty keys.

v2:
* removed unneeded jsonw_null from patch #6
* improved bash completions (and moved them into separate patch #7)
====================

Reviewed-by: Jakub Kicinski <[email protected]>
Signed-off-by: Daniel Borkmann <[email protected]>