Hooks for keystone authentication

This patch the logic and the sample configuration need to allow
Staccato to use the keystone middleware for authentication.  In
order to make this work we had to introduce a global CONF object.

blueprint add-security

Change-Id: Ic7c6e2ca00411c5a9e4468aeebdb823200659fd9
Fixing get text

Change-Id: Idd105068e17cb6ab6783b8242f1d40e0e088eae1
Cleaning up flake8 errors

Change-Id: If9b2f1ddfdf32d22f38fee25a8e7879a1f393cd9
Adding in integration tests

blueprint integration-tests

Change-Id: I3f7c8200a03ea60bca23563b49de8fd85126bf8d