Thank you for taking the time to report this bug and help to improve Ubuntu.
Actually, the current default version of /etc/dhcp3/dhclient.conf *does* request the NTP servers; this was changed in dhcp3 3.0.5-2, and apparently reintroduced in dhcp3 3.1.1-5ubuntu8 for the Ubuntu 9.04 release. So I'm marking this bug as fixed.
Thank you for taking the time to report this bug and help to improve Ubuntu.
Actually, the current default version of /etc/dhcp3/ dhclient. conf *does* request the NTP servers; this was changed in dhcp3 3.0.5-2, and apparently reintroduced in dhcp3 3.1.1-5ubuntu8 for the Ubuntu 9.04 release. So I'm marking this bug as fixed.