Add node def for puppet3 master

This change modifies install_puppet.sh to accept a --three option
setting it to install the latest puppet available. It also creates
a node definition for the puppetmaster.o.o node, the new 3 master,
and the master of the future. Changes were made to various classes
to allow the pinning to version 2.x to be turned off.

Change-Id: I805d6dc50b9de0d8a99cf818d22d06c2dea6090a