vcsrepo ignores "force" for git repos

currently vcsrepo's "force" parameter in puppet-3.8 seem to return string thus always evaluating to "true":
https://github.com/puppetlabs/puppetlabs-vcsrepo/blob/master/lib/puppet/type/vcsrepo.rb#L229
vs
https://github.com/puppetlabs/puppet/blob/master/lib/puppet/type/file.rb#L215

as a result any value in "force" is treated as true thus always forcing removal of existing directory