Uninstall and reinstall pylint.
We currently do **not** want pylint 1.0.0 since logilab-common-0.60.0 is not yet released.
Under python 2.6 using `{}.format()`(without an index) is a `ValueError`.
Merge pull request #6540 from s0undt3ch/develop

We currently do **not** want pylint 1.0.0 since logilab-common-0.60.0 is not yet released