Minor cleanup and fixes:
1. Small bits of cleanup to remove hardwired paths and test for images that live in /usr/testbed and need special handling. 2. Make sure that the image directory exists in /proj when taking a snapshot of a system image that lives in /usr/testbed since that is were we always write new images. 3. When deleting an image, remove the DB state for the highest numbered version if it never came ready/released.
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