Colorize Neutron log output and refactor log setup code

Bug 1214616

This patch adds colors to on-screen Neutron log output in the same way nova,
cinder, and heat engine do.
To this aim, colorized logging configuration has been moved to ./functions.
The reason for this refactoring is that these instruction are the same or
very similar for each project, with the only exception of the target
configuration file.

Change-Id: Idf0d1b842bb9ab046c9ef826de1dfc55b3f1df9d
Fix swift httpd on fedora

Implements a fedora equivalent of ubuntu's sites-enabled and moves
enabling of mod_wsgi to the installation period so that it doesn't have
to be handled in a platform dependant way later.

Fixes: bug 1226363
Change-Id: I85325179f1792d985b0375572abfe8c8a82fecc3
Merge "Colorize Neutron log output and refactor log setup code"
Merge branch 'master' of github.com:openstack-dev/devstack