Revert "Adjust python 2.6 jobs for oslo libraries"

Further discussion reached the consensus that we should treat all libs the same.

This reverts commit 030694fc10c7befd46b1ab6500896a707dba6c53.

Change-Id: Iecb019db7a05b5ce116a88da37b43e5d06bf1aa0
Merge "Revert "Adjust python 2.6 jobs for oslo libraries""