[MERGE] Remove duplicated class definitions and remove unused imports from pack_repo.py

[John Arbash Meinel]

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Andrew Bennetts wrote:
| This diff might look alarming, but it's actually harmless.  I noticed
that two
| entire classes were duplicated in pack_repo.py, and this patch just
removes the
| duplicates.  While I was cleaning things up I also removed all the unused
| imports in that file reported by pyflakes.
|
| -Andrew.
|
|

BB:approve

John
=:->

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