Deprecation warning: dynamic lookup of $git_name

When starting a drush-vagrant box for the first time, as it's being provisioned by Puppet, we get these deprecation warnings:

warning: Dynamic lookup of $git_name at /tmp/vagrant-puppet/modules-0/drush-vagrant/manifests/init.pp:96 is deprecated.  Support will be removed in Puppet 2.8.  Use a fully-qualified variable name (e.g., $classname::variable) or parameterized classes.
warning: Dynamic lookup of $git_name at /tmp/vagrant-puppet/modules-0/drush-vagrant/manifests/init.pp:98 is deprecated.  Support will be removed in Puppet 2.8.  Use a fully-qualified variable name (e.g., $classname::variable) or parameterized classes.
warning: Dynamic lookup of $git_email at /tmp/vagrant-puppet/modules-0/drush-vagrant/manifests/init.pp:101 is deprecated.  Support will be removed in Puppet 2.8.  Use a fully-qualified variable name (e.g., $classname::variable) or parameterized classes.
warning: Dynamic lookup of $git_email at /tmp/vagrant-puppet/modules-0/drush-vagrant/manifests/init.pp:103 is deprecated.  Support will be removed in Puppet 2.8.  Use a fully-qualified variable name (e.g., $classname::variable) or parameterized classes.