Add IPv6 support to snapshot socket

[eiffel-fl]

Hi.

This PR adds IPv6 support to snapshot socket:

$ python
>>> import socket
>>> s = socket.socket(socket.AF_INET6, socket.SOCK_STREAM)
>>> s.bind(('::1', 8082, 0, 0))
>>> s.listen(5)
zsh: suspended  python3
$ sudo ig snapshot socket --host
CONTAINER                                                                PROTOCOL LOCAL                                  REMOTE                                STATUS
...
                                                                         TCP      ::1:8082                               :::0                                  LISTEN 
...

Best regards.

[alban]

While you're working on this, it would be nice to print the v6only bool from IPv6 sockets.

sk->__sk_common.skc_ipv6only

See #1776 (comment)

(could be done in a different PR)

[mauriciovasquezbernal]

I'll suggest to rebase this on top of #1895, the result code will be much simpler IMO.

[eiffel-fl]

I'll suggest to rebase this on top of #1895, the result code will be much simpler IMO.

It is really funny because I would have suggest you to rebase on top of mine.

[mauriciovasquezbernal]

I don't have any issue. Let's get this in and then I'll rebase mine on top.

[mauriciovasquezbernal]

I also can implement ipv6 support on top of #1895, so we don't waste time reviewing this.

[blanquicet]

From my point of view, it makes much more sense to rebased this on top of the refactoring introduced in #1895, which IMO, is ready to go.

[eiffel-fl]

From my point of view, it makes much more sense to rebased this on top of the refactoring introduced in #1895, which IMO, is ready to go.

If I rebase this PR on top of the refactoring one, it will just delay its merge.

[eiffel-fl]

I rebased everything and the unit test confirms everything is OK, so it is time to merge this PR.

[mauriciovasquezbernal]

Looks good, some minor comments.

Remove

inspektor-gadget/pkg/gadgets/snapshot/socket/tracer/tracer.go

Line 51 in 7353540

func parseIPv4(ipU32 uint32) string {

[mauriciovasquezbernal]

LGTM. Thanks for handling all the comments.

[eiffel-fl]

Thank you for the review!