Nuke net.inet6.icmp6.rediraccept and allow redirects on interfaces

with autoconf enabled.
If one is doing SLAAC one does already trust link local icmp6 so the
policy for icmp6 redirects should be the same.
pointed out by & OK bluhm@; OK henning@

src/etc/examples/sysctl.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: sysctl.conf,v 1.2 2014/08/20 11:23:41 mikeb Exp $
+#	$OpenBSD: sysctl.conf,v 1.3 2014/08/27 14:04:15 florian 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
@@ -8,7 +8,6 @@
 #net.inet.ip.mforwarding=1	# 1=Permit forwarding (routing) of IPv4 multicast packets
 #net.inet.ip.multipath=1	# 1=Enable IP multipath routing
 #net.inet.icmp.rediraccept=1	# 1=Accept ICMP redirects
-#net.inet6.icmp6.rediraccept=1	# 1=Accept IPv6 ICMP redirects (for hosts)
 #net.inet6.ip6.forwarding=1	# 1=Permit forwarding (routing) of IPv6 packets
 #net.inet6.ip6.mforwarding=1	# 1=Permit forwarding (routing) of IPv6 multicast packets
 #net.inet6.ip6.multipath=1	# 1=Enable IPv6 multipath routing

src/etc/rc.conf

@@ -1,4 +1,4 @@
-#	$OpenBSD: rc.conf,v 1.197 2014/08/26 19:33:48 robert Exp $
+#	$OpenBSD: rc.conf,v 1.198 2014/08/27 14:04:15 florian Exp $
 
 # DO NOT EDIT THIS FILE!!
 #
@@ -40,7 +40,6 @@ route6d_flags=NO	# for normal use: ""
 			# be sure to set net.inet6.ip6.forwarding=1
 rtsold_flags=NO		# for normal use: interface
 			# be sure to set net.inet6.ip6.forwarding=0
-			# be sure to set net.inet6.icmp6.rediraccept=1
 lpd_flags=NO		# for normal use: "" (or "-l" for debugging)
 sensorsd_flags=NO	# for normal use: ""
 hotplugd_flags=NO	# for normal use: ""