Updated the usrer steps necessary to run the out of the box

[MATRIX4284]

image name gcr.io/<your_project>/pytorch_dist_mnist:latest wil cause the image pull to fail in case of non gcp users.
So included the yaml specs with the local image i.e. kubeflow/pytorch-dist-mnist-test:1.0.

[k8s-ci-robot]

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[coveralls]

Coverage remained the same at 22.97% when pulling 0a7e04f on MATRIX4284:master into f117363 on kubeflow:master.

[gaocegege]

/ok-to-test

[k8s-ci-robot]

@MATRIX4284: The following test failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
kubeflow-pytorch-operator-presubmit	0a7e04f	link	/test kubeflow-pytorch-operator-presubmit

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

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[gaocegege]

Why do we need such a Dockerfile

[MATRIX4284]

Added the required Dockerfile For mitigating the issue #245