Begin spec testing unbound::stub
Begin spec testing unbound::stub

This adds basic validation to avoid regressions in the future for
supporting singular and multiple addresses passed to the unbound::stub
define.

twc-openstack/puppet-unbound,icann-dns/puppet-unbound,mmickan/puppet-unbound,xaque208/puppet-unbound,xaque208/puppet-unbound,mmickan/puppet-unbound,twc-openstack/puppet-unbound,xaque208/puppet-unbound,icann-dns/puppet-unbound,icann-dns/puppet-unbound