runc is not using opencontainers/runtime-spec config for seccomp format

[grantseltzer]

The seccomp struct used in runc is redefined from runtime-spec's definition which is already vendored in. They're almost the same except for the Operator type being an int instead of a string. I'm fairly certain this is a relic from Docker.

If I can get some feedback, I can switch it over for consistencies sake without making any changes to the configs package api.

[grantseltzer]

It's also worth noting that there's discussion to update runtime-spec's seccomp format to a more expressive version currently being used in cri-o. If that comes to fruition it'd make more sense to do this afterwards.

[justincormack]

We could probably fix this anyway now.

[grantseltzer]

@justincormack I have a fix ready locally, going to wait for more discussion on the runtime-spec PR before opening something here

[crosbymichael]

This has been fixed when we bumped to runtime-spec rc5