vendor: introduce libcontainer/cgroups package

[jingxiaolu]

Introduce libcontainer/cgroups package for further cgroups handling refactor

Fixes: #344

Signed-off-by: Jingxiao Lu lujingxiao@huawei.com

[katacontainersbot]

PSS Measurement:
Qemu: 146593 KB
Proxy: 4690 KB
Shim: 8855 KB

Memory inside container:
Total Memory: 2045972 KB
Free Memory: 2007580 KB

[jingxiaolu]

This is the first PR for #344, introducing libcontainer/cgroups package for refactoring cgroups handling, as recommended by @jshachm.

Please share your comments on this issue 😄

Other PRs will come on including:

1. Refactoring with this libcontainer/cgroups package;
2. Adding containers to the same sandbox cgroup;
3. Adding proxy, qemu... to sandbox cgroup

[jshachm]

@sboeuf @jodh-intel @grahamwhaley PTAL

cc\ @WeiZhang555

[jodh-intel]

Hi @jingxiaolu - thanks for raising.

lgtm.

[devimc]

lgtm

[jshachm]

@jodh-intel CI failure looks same as kata-containers/tests#427 (see #385 (comment)) .

[amshinde]

@jingxiaolu I dont see any changes to the Gopkg.toml file here.

[jodh-intel]

@amshinde - I noticed that too. I believe that's because no change is necessary to Gopkg.toml since it already contains an entry for runc - the .toml file doesn't seem to record the (sub-)packages used - that only gets added to the .lock file.

[amshinde]

@jodh-intel You are right. Missed out on the previous opencontainers package.

[amshinde]

@jingxiaolu Can you rebase your changes on top of the latest master? CI failures have been fixed on master.

[sboeuf]

@jingxiaolu sorry but we cannot accept this PR as is. The vendoring diff that you're introducing here depends on the fact that you've added an import into the code, meaning that a dep update gave you such a diff.
So basically, you will have to submit this change through the PR introducing the change in the code where you import the new package.

[jingxiaolu]

@sboeuf that's reasonable, I'll resubmit with more implementation~

@jshachm @jodh-intel @devimc @amshinde thanks for your time 👍