master.passwd/group: add _ntp user and group. Update UPDATING.

docs/UPDATING

@@ -1,3 +1,14 @@
+20130403:
+	With the addition of ntpd(8), an _ntp user and group must be added.
+	Run these commands to add the _ntp user and group:
+
+	# groupadd -g 123 _ntp
+	# useradd -g _ntp -s /bin/false -d / -u 123 _ntp
+
+	It is safe to ignore the warning about /bin/false not being listed
+	in /etc/shells. To run ntpd on start-up, create /etc/ntpd.conf
+	See `man ntpd` and `man ntpd.conf` for details.
+
 20130312:
 	/bin/ksh was imported and needs to be added to your /etc/shells.
 	Run this command to add it:

etc/group

@@ -27,3 +27,4 @@ mail:*:43:
 sshd:*:44:
 nogroup:*:99:
 users:*:100:
+_ntp:*:123:

etc/master.passwd

@@ -13,5 +13,6 @@ sshd:*:22:22::0:0:sshd:/:/bin/sh
 smtpd:*:25:25::0:0:smtpd:/:/bin/sh
 postfix:*:27:27::0:0:postfix:/usr/var/spool/postfix:/bin/false
 postgres:*:30:30::0:0:postgresql:/:/bin/false
+_ntp:*:123:123::0:0:openntpd:/:/bin/false
 games:*:9998:13::0:0:games:/:/bin/sh
 nobody:*:9999:39::0:0:Unprivileged user:/tmp:/bin/sh