allow specifying credentials for source registry on import image

[nathana1]

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[azuresdkci]

Can one of the admins verify this patch?

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The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#3467

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Azure/azure-sdk-for-ruby#1574

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Azure/azure-sdk-for-node#3780

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Azure/azure-sdk-for-java#2460

[marstr]

Ready for me to merge, @nathana1?

[nathana1]

@djyou, @xiadu94 where are we on this?

[djyou]

@nathana1 Looks good. We'll release SDK once this is merged.