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.cf

@@ -0,0 +1,13 @@
+config * {
+}
+default full {
+	rw *;
+}
+default * {
+	logfile /var/log/conserver/&.log;
+	timestamp "";
+	include full;
+}
+access * {
+	trusted 127.0.0.1;
+}