Add disable_dhclient to README
Add disable_dhclient to README

bmjen/puppetlabs-ntp,HelenCampbell/puppetlabs-ntp,rdo-puppet-modules/puppetlabs-ntp,puppetnix/puppetlabs-ntp,HelenCampbell/puppetlabs-ntp,rdo-puppet-modules/puppetlabs-ntp,puppetnix/puppetlabs-ntp,fuel-infra/puppetlabs-ntp,powertoaster/puppetlabs-ntp,DavidS/puppetlabs-ntp,plumgrid/puppetlabs-ntp,plumgrid/puppetlabs-ntp,powertoaster/puppetlabs-ntp,puppetlabs/puppetlabs-ntp