dhcp: Fixed depency error from dhcp server when listen interface is defined.

dhcp/manifests/init.pp

@@ -78,6 +78,7 @@ class dhcp::server::common {
                     mode    => "0644",
                     owner   => "root",
                     group   => "root",
+                    require => Package["dhcp"],
                     notify  => Service["dhcpd"],
                 }
             }