Adjust to "pool" usage in our standard ntp.conf, pointed out

by Connor McLaughlan.

etc/rc.d/ntpdate

@@ -1,6 +1,6 @@
 #!/bin/sh
 #
-# $NetBSD: ntpdate,v 1.20 2009/08/03 18:43:48 perry Exp $
+# $NetBSD: ntpdate,v 1.21 2020/12/25 13:42:02 martin Exp $
 #
 
 # PROVIDE: ntpdate
@@ -21,7 +21,7 @@ ntpdate_start()
 		ntpdate_hosts=$(awk '
 			/^#/				{ next }
 			/^(server|peer)[ \t]*127.127/	{ next }
-			/^(server|peer)/		{ if ($2 ~ /^-[46]/)
+			/^(server|peer|pool)/		{ if ($2 ~ /^-[46]/)
 							    print $3
 							  else
 							    print $2 }