Keystone auth middleware configuration fixed.

Change-Id: Iebfa6f47137c23681747fa7e359bb79fb63b5823
Fixes: bug #1186843
(cherry picked from commit 635d95df03f7003f0cd0fdee88a3505711cce12d)
Adding lintstack to support pylint testing.

* it should be carefully configured in future

Change-Id: I35f21e7fbfab3c5fa07cd3652f47469bb2939abd
(cherry picked from commit 96d100b4244fa1dd2e5ca1cc11cb5360b1a6abd2)
Merge "Adding lintstack to support pylint testing." into stable/0.1