rc: launch ntpd if /etc/ntpd.conf is present.

Example of a basic ntpd.conf file for an ntp client:

------ CUT & PASTE BETWEEN DASHES --------
servers pool.ntp.org
------------------------------------------

Do `man ntpd.conf` for more info on ntpd.conf

etc/rs.inet

@@ -60,6 +60,7 @@ service down "$1"
 kill_by_name dhcpd
 kill_by_name nonamed
 kill_by_name syslogd
+kill_by_name ntpd
 
 # Wait a moment to let daemons clean themselves up
 sleep 3
@@ -73,6 +74,7 @@ else
 fi
 daemonize nonamed -L
 daemonize syslogd
+test -f /etc/ntpd.conf && daemonize ntpd
 
 # Restart SSH daemon if installed and running
 if [ -f /usr/pkg/etc/rc.d/sshd ]

etc/usr/rc

@@ -210,6 +210,7 @@ start)
 	    # The last daemon has been started, so close the list:
 	    echo .
 	fi
+	test -f /etc/ntpd.conf && daemonize ntpd
     fi
 
     if [ "$net" ]