Add sandbox config to image pull

[jterry75]

Adds the sandbox config to the image pull command so a config can
contain the podsandbox context to pull the image in.

Signed-off-by: Justin Terry (VM) juterry@microsoft.com

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[feiskyer]

@jterry75 Thanks for the PR.

Could you sign CLA according to https://github.com/kubernetes/community/blob/master/CLA.md#the-contributor-license-agreement?

[feiskyer]

LGTM, but let's wait a while for #376 because the repo has been moved to new org.

[feiskyer]

/lgtm

[feiskyer]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: feiskyer, jterry75

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