testing/fwknop: fix initd

This fixes a possible failure to start on boot:

pcap_open_live() error: eth0: That device is not up

testing/fwknop/fwknopd.initd

@@ -4,6 +4,11 @@ pidfile="/var/run/fwknop/fwknopd.pid"
 command=/usr/sbin/fwknopd
 command_args="--pid-file $pidfile $fwknopd_args"
 
+depend() {
+	use logger
+        after net
+}
+
 start_pre() {
 	checkpath --directory ${pidfile%/*}
 }