Robert Collins e6dc5821f5 Improve tripleo nodepool image build efficiency.
Turns out there is a cache of git trees built. We can use that to
avoid some clones. There are more that can be saved - this is the low
hanging fruit (with a bug files and linked for the harder stuff).

Change-Id: Ib720db7b963a314ad28ef4287d7965c5c30f0883
2014-01-19 09:18:03 +13:00
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