restore: apply resource limits

[avagin]

When C/R was implemented, it was enough to call manager.Set to apply
limits and to move a task. Now .Set() and .Apply() have to be called
separately.

Fixes: 8a740d5 ("libcontainer: cgroups: don't Set in Apply")
Signed-off-by: Andrei Vagin avagin@virtuozzo.com

Cc: @cyphar

[TomSweeneyRedHat]

IDK if you need it elsewhere or not for sure, but you're doing
return c.cgroupManager.Set(c.config)
Near line 187 in the Set function and I don't see a call to Apply elsewhere. Given your PR description, do you need to add a corresponding apply() call for that Set call too?

[avagin]

@TomSweeneyRedHat .Apply() adds processes into cgroups. container.Set() is called when a container is running, so all processes are in required cgroups already.

[hqhq]

LGTM

[mrunalp]

LGTM