Add skip-in-flight and link-remap criu options for checkpoint and restore

[dleviminzi]

This is a relatively small PR that exposes the criu options below when using the runc checkpoint and restore functionality.

--tcp-skip-in-flight
: Skip in-flight TCP connections. See
criu --skip-in-flight option.

--link-remap
: Allow one to link unlinked files back when possible. See
criu --link-remap option.

With regards to the lint error below, I followed the naming convention of the already present TcpEstablished when adding TcpSkipInFlight. I could leave it as it or change both or change just my addition. Though the last option would look a bit weird I think.

[kolyshkin]

Hmm, if I'm not mistaken, both options are for checkpoint only.

[dleviminzi]

Hmm, if I'm not mistaken, both options are for checkpoint only.

I've removed those options from restore.

[kolyshkin]

@dleviminzi can you squash the commits please?

[dleviminzi]

@dleviminzi can you squash the commits please?

No problem, just did.

[kolyshkin]

LGTM (and I think we can ignore linter-extra warning here).

[kolyshkin]

@opencontainers/runc-maintainers PTAL

[rata]

LGTM, thanks!

Cool that the current criurpc version we are using already has those fields present, so this patch is quite simple :)

It seems ok to keep the warning for now, we can fix it in another PR if we want to.