python3: xrange no longer exists

range now behaves like xrange did in Python 2.

http://docs.python.org/3.1/whatsnew/3.0.html

Change-Id: I71bef224fb6b0e972373a024f8b86355b5970827
Signed-off-by: Chuck Short <chuck.short@canonical.com>
Make HACKING.rst DRYer

Reference the OpenStack hacking guide in HACKING.rst and remove
duplicated entries.

Change-Id: I80099c4da8928874f4647ab6f306876db126b0a3
Merge "Make HACKING.rst DRYer"
Merge "python3: xrange no longer exists"