refs #2023 - always write using_storeconfigs default as a boolean

fixes #2020 - PuppetSetting is an instance, not class

fixes #1995 - enable param class ENC by default on Puppet 2.6.5+

fixes #1994 - set vardir for puppet 3, use --configprint

When running Puppet 3 as a non-root user (i.e. foreman), both --confdir and
--vardir have to be specified as per Puppet #16637, else SSL settings dependent
on vardir will fail.

This adds a new puppetvardir setting used with puppetconfdir, and supports...