Revert "(maint) Add puppetversion setting variable"

This reverts commit 914a4a3b85dbca16343ad1f24679fd034dadc845.
(maint) Better means of allowing puppet_version per sim

Rather than using the global setting, we now allow puppet_version to be
specified as part of the simulation step.
Merge pull request #57 from briancain/maint/master/add_puppetversion_setting

Maint/master/add puppetversion setting