In 06-openstack-all\03-ntp-config.sh the three sed commands are pulling the first three lines form config\ntp.conf which is not how config\ntp.conf is structured.
I would suggest to write the ntp servers on top of the config\ntp.conf file (which what I did), or fix the sed command to get the uncommitted servers.
Fixed Issue #3: NTP servers are now listed on the top of the config file
I've updated ntp.conf to list three servers on the top. Thanks for reporting!