(#13595) initialize_everything_for_tests couples modules Puppet ver
(#13595) initialize_everything_for_tests couples modules Puppet ver

Replace regex used in spec_helper.rb to disallow both Puppet 2.6 and any
2.7 prior to 13.

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