Azure-img-utils

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- Drive image removal by image URN
- Make all args optional at class instantiation of AzureImage
+ Instead catch missing args in a lazy fashion

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- Capitalize Hyper v default generation
- Raise exception if resource group missing when creating or
deleting compute images.

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- No changes: Re-sync OBS and PyPI versions.

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- Add method for removing an image version from an offer.

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- Add rpm-macros to build requirements in spec.

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- Retry all failed requests