Signed-off by: Rosen Penev <rosenp@gmail.com>

As discussed in #543, we can announce the SFTP service via Avahi
when sftp-server is installed.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

recent changes in trunk allow us to specify the userid inside the openwrt makefile.
the info is stored int he meta data of the IPK contorl file and users are generated
by the new generic postinst trigger.

Signed-off-by: John Crispin <blogic@openwrt.org>

Signed-off-by: Peter Wagner <tripolar@gmx.at>