added ::fluentd::user

this will manage the user if  is set to true. This will add the td-agent user to the user group 'adm', so td-agent can view log files under /var/log/*.

spec/classes/fluentd_user_spec.rb

@@ -0,0 +1,22 @@
+require 'spec_helper'
+
+describe 'fluentd::user', :type => :class do
+  let(:facts) {
+    {
+      :osfamily        => 'Debian',
+      :lsbdistid       => 'Ubuntu',
+      :operatingsystem => 'Ubuntu',
+      :lsbdistcodename => 'precise',
+    }
+  }
+
+  describe 'when called with no parameters on Ubuntu' do
+    it {
+      should contain_user('fluentd').with({
+        'name'   => 'td-agent',
+        'gid'    => 'td-agent',
+        'groups' => ['adm']
+      })
+    }
+  end
+end