add EnforceRFC952 to sample config
add EnforceRFC952 to sample config

mesosphere/mesos-dns,denen99/mesos-dns,vivint-smarthome/mesos-dns,mesosphere/mesos-dns,alberts/mesos-dns,alberts/mesos-dns,denen99/mesos-dns,saagie/mesos-dns,vivint-smarthome/mesos-dns