Remove unused openntpd.conf template
Speed up ntpd startup when no external server is used

Previously it could take serveral minutes to get the ntp server into a state
where it would start accepting client connections (when no external ntp server
was specified). This was pretty annoying when doing lot of reinstalls of the
admin node and starting clients directly after the install-chef run (e.g. for
smoketesting).
Merge pull request #53 from rhafer/fix/ntp-startup-delay

reduce ntp startup delay when using no external server