#736860 python-apt: Fix policy test to not rely on system state and re-enable

#736860#5
Date:
2014-01-27 19:39:18 UTC
From:
To:
tests/test_policy.py checks whether the pin priority of APT is greater
than 1 and less than 1001 which might not be the case. This causes
python-apt to FTBFS on ppc64.

We should either drop the test or use dummy repositories. I report
it as a bug so I don't forget about it.