Automatic merge from submit-queue
CRI: Add init containers
This PR adds init containers support in CRI.
CC @yujuhong @Random-Liu @yifan-gu
Also CC @kubernetes/sig-node @kubernetes/sig-rktnetes
Automatic merge from submit-queue
Instruct PLEG to detect pod sandbox state changes
This PR adds a Sandboxes list in `kubecontainer.Pod`, so that PLEG can check
sandbox changes using `GetPods()` . The sandboxes are treated as regular
containers (type `kubecontainer.Container`) for now to avoid additional
changes in PLEG.
/cc @feiskyer @yifan-gu @euank