Work around issue in /etc/rc.d/routing

The loop in _check_dynamicrouting() to check for enabled routing daemons
hangs with rcorder in the foreground, seemingly forever.  When run
manually with an equivalent commandline, the command runs fine so
presumably something about the subshell environment is broken in certain
cases.  More debugging is required, but it is difficult as part of the
startup progress.

Thus, disable this check entierly by setting icmp_drop_redirect=NO.

libexec/rc/rc.conf

@@ -263,7 +263,7 @@ log_in_vain="0"			# >=1 to log connects to ports w/o listeners.
 tcp_keepalive="YES"		# Enable stale TCP connection timeout (or NO).
 tcp_drop_synfin="NO"		# Set to YES to drop TCP packets with SYN+FIN
 				# NOTE: this violates the TCP specification
-icmp_drop_redirect="auto" 	# Set to YES to ignore ICMP REDIRECT packets
+icmp_drop_redirect="NO" 	# Set to YES to ignore ICMP REDIRECT packets
 icmp_log_redirect="NO"		# Set to YES to log ICMP REDIRECT packets
 network_interfaces="auto"	# List of network interfaces (or "auto").
 cloned_interfaces=""		# List of cloned network interfaces to create.