packaging: spec: align to latest Fedora Guidelines

Aligned with https://fedoraproject.org/wiki/Packaging:Python
Latest revision as of 15:58, 22 October 2014

Change-Id: I2808fc348d5d55e3e7208dc3fcbb3fe494e7b71f
Signed-off-by: Sandro Bonazzola <sbonazzo@redhat.com>