Description of problem:

Seen when running the same type of test as described in:  https://bugzilla.redhat.com/show_bug.cgi?id=1451110.   

However this message is popping a lot even when pods are not having problems.   While creating 125 pods on a node, this message occurred 901 times:

May 16 13:29:00 svt-n-2-67 atomic-openshift-node: W0516 13:29:00.278604   76000 docker_sandbox.go:263] NetworkPlugin cni failed on the status hook for pod "deploymentconfig2v6-1-796rm_svt-2-5": Unexpected command output nsenter: cannot open : No such file or directory


Log spam?  or real problem?


Version-Release number of selected component (if applicable): 3.6.74


How reproducible:  Always when creating a large number of pods


Steps to Reproduce:
1. Run cluster-loader (https://github.com/openshift/svt/tree/master/openshift_scalability) with the configuration below on a cluster with 2 schedulable nodes with max-pods set at least to 125.



Actual results:

Many occurrences of:

May 16 13:29:00 svt-n-2-67 atomic-openshift-node: W0516 13:29:00.278604   76000 docker_sandbox.go:263] NetworkPlugin cni failed on the status hook for pod "deploymentconfig2v6-1-796rm_svt-2-5": Unexpected command output nsenter: cannot open : No such file or directory


Expected results:


Additional info:

projects:
  - num: 10
    basename: svt-2-
    tuning: default
    templates:
      -
        num: 1
        file: ./content/build-config-template.json
      -
        num: 1
        file: ./content/build-template.json
      -
        num: 1
        file: ./content/image-stream-template.json
      - 
        num: 5   
        file: ./content/deployment-config-1rep-pause-template.json
        parameters:
          -
            ENV_VALUE: "asodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij12"
      -
        num: 10
        file: ./content/deployment-config-2rep-pause-template.json
        parameters:
          -
            ENV_VALUE: "asodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij0emc2oed2ed2ed2e2easodfn209e8j0eij12"
      -
        num: 2
        file: ./content/ssh-secret-template.json
      -
        num: 1
        file: ./content/route-template.json
      # rcs and services are implemented in deployments.
tuningsets:
  - name: default
    templates:
      stepping:
        stepsize: 3
        pause: 3 s
      rate_limit:
        delay: 250 ms
quotas:
  - name: default