Use command array in mpi job prototype

[Jeffwan]

Meet this problem when I yaml.Unmarshal(manifest, &mpiJob)

error unmarshaling JSON: while decoding JSON: json: cannot unmarshal string into Go struct field Container.command of type []string"

MPI job spec template uses corev1.PodTemplateSpec. Commands and Args are both []string type.

https://github.com/kubernetes/api/blob/369c77d0cd027d5cb8eebabebfb64d38b21538a0/core/v1/types.go#L2065-L2080

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This change is 

[k8s-ci-robot]

Hi @Jeffwan. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[Jeffwan]

/cc @everpeace

[everpeace]

Thanks, looks good to me.

[Jeffwan]

/assign @jlewi

[jlewi]

/ok-to-test
/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: jlewi

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[Jeffwan]

deploy-kubeflow-test_katib-test-katib 2m4s. Not related to PR
/test kubeflow-presubmit

[Jeffwan]

Looks like it experience Quota limitation error.
/test kubeflow-presubmit

[jlewi]

Looks like we ran out of disk space in our ci cluster.

+ gcloud deployment-manager --project=kubeflow-ci deployments update kfctl-2ba2-storage --config=storage-kubeflow.yaml
kfctl-2ba2 exists
The fingerprint of the deployment is TdfAv7dn-hCn7VBqJgxl7Q==
Waiting for update [operation-1549956839590-581ad72d74c4e-dd513b89-df67252d]...
.......failed.
ERROR: (gcloud.deployment-manager.deployments.update) Error in Operation [operation-1549956839590-581ad72d74c4e-dd513b89-df67252d]: errors:
- code: RESOURCE_ERROR
 location: /deployments/kfctl-2ba2-storage/resources/kfctl-2ba2-storage-pipeline-nfs
 message: "{\"ResourceType\":\"compute.v1.disk\",\"ResourceErrorCode\":\"403\",\"\
   ResourceErrorMessage\":{\"code\":403,\"errors\":[{\"domain\":\"usageLimits\",\"\
   message\":\"Quota 'DISKS_TOTAL_GB' exceeded. Limit: 16384.0 in region us-east1.\"\
   ,\"reason\":\"quotaExceeded\"}],\"message\":\"Quota 'DISKS_TOTAL_GB' exceeded.\
   \ Limit: 16384.0 in region us-east1.\",\"statusMessage\":\"Forbidden\",\"requestPath\"\
   :\"https://www.googleapis.com/compute/v1/projects/kubeflow-ci/zones/us-east1-d/disks\"\
   ,\"httpMethod\":\"POST\"}}"

/test all

[jlewi]

Related issue: #388

[Jeffwan]

/test kubeflow-presubmit

Have another try

[jlewi]

/test all