Description of Problem:
While redhat-config-date-1.5.5-1 is a start, the solution still needs work. 
Unfortuneately, as pointed out in
https://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=70557
restrict needs ip numbers ... not a name.  Unless ntp is changed so restrict
looks up numbers or there is some other magic way to do what restrict
192.43.244.18 would do, this package will need to look up the ip-addr and plug
it into the restrict statement.

After applying 1.5.5-1 and running it to update /etc/ntp.conf, I looked in
/vat/log/messages and found:

ntpd[15033]: getnetnum: "time.nist.gov" invalid host number, line ignored

replacing "time.nist.gov" with "192.43.244.18" and restarting ntpd succeeded.