Add the ability to run /usr/sbin/crashinfo on a new core dump automatically

during boot.  Right now this is disabled by default, but it can be enabled
by setting 'crashinfo_enable=YES' in rc.conf.

MFC after:	2 weeks

etc/defaults/rc.conf

@@ -539,6 +539,8 @@ chkprintcap_flags="-d"	# Create missing directories by default.
 dumpdev="AUTO"		# Device to crashdump to (device name, AUTO, or NO).
 dumpdir="/var/crash"	# Directory where crash dumps are to be stored
 savecore_flags=""	# Used if dumpdev is enabled above, and present.
+crashinfo_enable="NO"	# Automatically generate crash dump summary.
+crashinfo_program="/usr/sbin/crashinfo"	# Script to generate crash dump summary.
 quota_enable="NO"	# turn on quotas on startup (or NO).
 check_quotas="YES"	# Check quotas on startup (or NO).
 quotaon_flags="-a"	# Turn quotas on for all file systems (if enabled)

etc/rc.d/savecore

@@ -65,6 +65,9 @@ savecore_start()
 
 	if savecore -C "${dumpdir}" "${dev}" >/dev/null; then
 		savecore ${savecore_flags} ${dumpdir} ${dumpdev}
+		if checkyesno crashinfo_enable; then
+			${crashinfo_program} -d ${dumpdir}
+		fi
 	else
 		[ -z "${rc_quiet}" ] && echo "No core dumps found"
 	fi