init: use include for ntp class

Allow to inject specific parameters via Hiera by using incluse instead
of class {'...'}.

Signed-off-by: Emilien Macchi <emilien.macchi@enovance.com>

manifests/init.pp

@@ -58,7 +58,7 @@ This node is under the control of Puppet ${::puppetversion}.
   }
 
 # NTP
-  class { 'ntp': }
+  include ::ntp
 
 # Strong root password for all servers
   user { 'root':

spec/classes/cloud_init_spec.rb

@@ -37,6 +37,9 @@ describe 'cloud' do
         :mode    => '0644'
       }
     end
+
+    it {should contain_class('ntp')}
+
     it {should contain_file('/etc/motd').with(
       {:ensure => 'file'}.merge(file_defaults)
     )}