openstack-common.install: Fix a deprecated parameter in the puppet configuration

openstack-common.install: Fix a deprecated parameter in the puppet configuration

Warning: Setting templatedir is deprecated. See http://links.puppetlabs.com/env-settings-deprecations
(at /usr/lib/ruby/vendor_ruby/puppet/settings.rb:1095:in `block in issue_deprecations')
the file test is not needed because all puppet files are included in puppet and puppet-common packages (/etc/default/puppet, /etc/puppet/puppet.conf, etc...)