[Draft] feat: Add sos manifest loading

[ryan-blakley]

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Complete Description of Additions/Changes:

Added in ability to load the manifest file from the sos archive, to load the spec file path into the broker directly.

[ryan-blakley]

Closing for now, as there to do in the sos project before this can continue.

[candlepin-bot]

Can one of the admins verify this patch?