add two carp(4) sysctl examples: net.inet.carp.preempt=1 and

net.inet.carp.log=1. it is so common to enable carp preemption...
yes! henning@, ok mpf@

src/etc/sysctl.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: sysctl.conf,v 1.41 2007/01/09 04:11:29 itojun Exp $
+#	$OpenBSD: sysctl.conf,v 1.42 2007/02/15 20:43:33 reyk Exp $
 #
 # This file contains a list of sysctl options the user wants set at
 # boot time.  See sysctl(3) and sysctl(8) for more information on
@@ -17,6 +17,8 @@
 #net.inet.ipcomp.enable=1	# 1=Enable the IPCOMP protocol
 #net.inet.etherip.allow=1	# 1=Enable the Ethernet-over-IP protocol
 #net.inet.tcp.ecn=1		# 1=Enable the TCP ECN extension
+#net.inet.carp.preempt=1	# 1=Enable carp(4) preemption
+#net.inet.carp.log=1		# 1=Enable logging of carp(4) packets
 #ddb.panic=0			# 0=Do not drop into ddb on a kernel panic
 #ddb.console=1			# 1=Permit entry of ddb from the console
 #fs.posix.setuid=0		# 0=Traditional BSD chown() semantics