Remove unused code from libpod

[Luap99]

The libpod package should only compile on linux. The remote client
should never try to import this package.

Since these files do not add any value we should remove them, this
prevents people from accidentally importing this package because it would
fail to compile on windows/macos.

[openshift-ci]

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[rhatdan]

LGTM should help us from accidently sucking it into the podman-remote code base.

[mheon]

LGTM!

[mheon]

[+1771s] [Fail] Podman unshare [It] podman unshare exit codes

Been seeing this one failing on a bunch of PRs. @edsantiago Potential new flake?

[Luap99]

[+1771s] [Fail] Podman unshare [It] podman unshare exit codes

Been seeing this one failing on a bunch of PRs. @edsantiago Potential new flake?

Yes definitely a new flake, the actual problem is this warning message time="2021-09-17T09:29:20-05:00" level=warning msg="Failed to add pause process to systemd sandbox cgroup: mkdir /sys/fs/cgroup/devices/user.slice/user-2604.slice: permission denied" added in #11606
@giuseppe PTAL

[TomSweeneyRedHat]

LGTM
once the tests are hip

[rhatdan]

@edsantiago we have a new flake caused by the podman unshare exit code test.

[+1604s] : time="2021-09-17T16:07:41-05:00" level=warning msg="Failed to add pause process to systemd sandbox cgroup: mkdir /sys/fs/cgroup/pids/user.slice/user-9141.slice/[email protected]/user.slice: permission denied"

For some reason once in a while the cgroups are failing to be checked.
@giuseppe Thoughts.

[rhatdan]

/lgtm
/hold

[rhatdan]

/hold cancel

[giuseppe]

[+1604s] : time="2021-09-17T16:07:41-05:00" level=warning msg="Failed to add pause process to systemd sandbox cgroup: mkdir /sys/fs/cgroup/pids/user.slice/user-9141.slice/[email protected]/user.slice: permission denied"

For some reason once in a while the cgroups are failing to be checked.
@giuseppe Thoughts.

opened a PR: #11648