ipfilter: Load optionlist prior to ippool invocation

As a safety precaution df381bec2d limits ippool hash table size to 1K.
This causes any legitimely large hash table to fail to load. The
htable_size_max ipf tuneable adjusts this but the adjustment is made
in the ipfilter rc script, invoked after the ippool script (because it
depends on ippool). Let's load the ipfilter_optionlist in ippool as well.
ipfilter_optionlist load will also occur in the ipfilter rc script in case
the user uses ipfilter without ippool.

Fixes:		df381bec2d
MFC after:	3 days

libexec/rc/rc.d/ippool

@@ -27,6 +27,9 @@ required_modules="ipl:ipfilter"
 ippool_start_precmd()
 {
 	rc_flags="-f ${ippool_rules} ${rc_flags}"
+	if [ -n "${ifilter_optionlist}" ]; then
+		${ipfilter_program:-/sbin/ipf} -T "${ipfilter_optionlist}"
+	fi
 }
 
 ippool_reload()