Python 3: Cope with the configparser import being renamed

On Python 3, this has been renamed to be in all lowercase.

Change-Id: I19ed151aa7f7a4d1e1f11be4b4867e6eb92caff5
Use RawConfigParser rather than ConfigParser

We don't need the variable substitution handling, but leaving this
in does cause issues under python 3 due to the %s' present in the
link templates.

Change-Id: I0c26139db7d18c1068a4b7bafc01069ffb107e39