Automatic merge from submit-queue

kubenet: SyncHostports for both running and ready to run pods.

This fixes the race that happens in rktnetes when pod B invokes
'kubenet.SetUpPod()' before another pod A becomes actually running.

The second 'kubenet.SetUpPod()' call will not pick up the pod A
and thus overwrite the host port iptable rules that breaks pod A.

This PR fixes the case by listing all 'active pods' (all non-exited
pods) instead of only running pods.

Fix https://github.com/kubernetes/kubernetes/issues/27975 

Originally discussed in https://github.com/kubernetes/kubernetes/pull/27914#issuecomment-228140108

cc @euank @freehan @dcbw