Dan Prince 56492c2374 Nail prettytable test dependency at 0.5.0.
Prettytable 0.6.0 has a bad md5sum in PyPi and as such causes tests
to fail when creating a new venv. Nail the version to 0.5.0.

Fixes LP Bug #1000757.

Change-Id: I121ba8d411e47c2fe154370d9c3c941e25331ce6
2012-05-17 10:38:30 -04:00
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