[Commotion-admin] [luci-commotion] Added upgrade utilities (#454)

[Josh King]

This seems to work, and I have test images where I can upload bundles. But I'm not sure how best to test that all the features of the new upgrade utilities function correctly.

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Reply to this email directly or view it on GitHub:
https://github.com/opentechinstitute/luci-commotion/pull/454#issuecomment-78144449
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