Add doc building script

Added a doc building script that uses puppetdoc to go over
all modules in the Puppetfile and generate RDoc.

Change-Id: Ibf91fd5ed94725bbff52632e9f45b2c513b57ce9
Merge "Add doc building script"
Add graphite role to build node

Previously, collectd was set up on many node scenarios and was
being configured to send data to a carbon instance on the build
node.  However, the build node wasn't actually running graphite,
which rsulted in a good bit of logspam and obviously didn't
help anyone collect any data.  This commit adds graphite to the
build node role so that something is listening for incoming data
from collectd.

Change-Id: I6a5f5c0c11bd9f3a61ec7f20d0b35cddf83b50c6
Merge branch 'master' of https://github.com/stackforge/puppet_openstack_builder into coi-development