Commits on May 18, 2018

1. Upgrade chromogenic to fix imaging cleaning issue …

   Imaging would occasionally fail in the cleaning phase with:
   "UnboundLocalError: local variable properties referenced before assignment"
   
   Here is the explanation from the chromogenic project (77841b08114d7193ea432b214edd57be74906a0d):
   
       When an instance is imaged, a snapshot is made of the instance, then that
       snapshot is mounted locally so that the filesystem can be cleaned. Then that
       cleaned image is then uploaded as the image, which will appear in atmosphere.
   
       When chromogenic images, it actually checks if a snapshot has been made before
       and just uses that rather than always creating a snapshot.
   
       Just prior to uploading chromogenic looks up the snapshot image (what it calls
       the parent image), and uses properties on it for the final image. The bug was
       that looking up the snapshot would return None sometimes, which would cause
       the properties lookup to fail.
   
       Chromogenic would first populate the cache, when it checked if the snapshot
       had ever been created. Then it would create the snapshot (never updating the
       cache) then would later ask if the cache had the snapshot.
   
       So the error can be reliably reproduced, if you delete the snapshot before you
       retry imaging.

   

   cdosborn committed May 18, 2018
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2. Update changelog, fix spacing

   

   cdosborn committed May 18, 2018
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