(maint) update PUPPET_VERSION default to be 3.8.1
(maint) update PUPPET_VERSION default to be 3.8.1

fuel-infra/puppetlabs-stdlib,DavidS/puppetlabs-stdlib,jbondpdx/puppetlabs-stdlib,yadavnikhil/puppetlabs-stdlib,HelenCampbell/puppetlabs-stdlib,puppetlabs/puppetlabs-stdlib