Change the messages of the ICMP bad port bandwidth limiter from

a kernel printf to a log output with the priority of LOG_NOTICE.

This way the messages still show up in /var/log/messages but no
longer spam the console every other second on busy servers that
are port scanned:
 "Limiting open port RST response from 114 to 100 packets/sec"

PR:		kern/147352
Submitted by:	Eugene Grosbein <eugen-at-eg sd rdtc ru>
MFC after:	1 week

sys/netinet/ip_icmp.c

@@ -42,6 +42,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/time.h>
 #include <sys/kernel.h>
 #include <sys/sysctl.h>
+#include <sys/syslog.h>
 
 #include <net/if.h>
 #include <net/if_types.h>
@@ -975,7 +976,7 @@ badport_bandlim(int which)
 		 * the previous behaviour at the expense of added complexity.
 		 */
 		if (V_icmplim_output && opps > V_icmplim)
-			printf("Limiting %s from %d to %d packets/sec\n",
+			log(LOG_NOTICE, "Limiting %s from %d to %d packets/sec\n",
 				r->type, opps, V_icmplim);
 	}
 	return 0;			/* okay to send packet */