Adding common base class for Rackspace Resource providers

Change-Id: If7d15e01c53fb6db4bdee5759b0ef4f087640c58
Use print_function compatible syntax

This changes the code to use a python 3.x compatible
print function syntax (or import from __future__ where
necessary)

Change-Id: Ia1f19d0ac082853d25c7c9b754b440469c0526eb
Merge "Adding common base class for Rackspace Resource providers"
Merge "Use print_function compatible syntax"
Merge branch 'master' into bp-dev/rackspace-cloud-servers-provider
PEP8, pyrax troubleshooting.

Change-Id: Iad41933e11f1414ea5cc41af0c20dfebb6d5f71e