conserver: add advanced serial console package

Conserver is an application that allows multiple users to use
serial consoles at the same time, with logging.  It has a client-
server design which makes it easy to manage a distributed set
of serial consoles.  Logging makes post-crash analyses easier.

Signed-off-by: Bjørn Mork <bjorn@mork.no>

net/conserver/files/conserver.init

@@ -0,0 +1,14 @@
+#!/bin/sh /etc/rc.common
+# Copyright (C) 2017 Bjørn Mork <bjorn@mork.no>
+
+START=99
+STOP=99
+
+USE_PROCD=1
+
+start_service() {
+	[ -d /var/log/conserver ] || mkdir -m 0755 -p /var/log/conserver
+	procd_open_instance
+	procd_set_param command /usr/sbin/conserver
+	procd_close_instance
+}