We add the necessary Makefile, hotplug, config, and init bits
so that p910nd daemon runs as user:group p910nd:lp by default.
This eliminates an unnecessary root daemon.

The hotplug script sets the permissions of the USB lp
device(s) to read-write owner and group and no access to
anyone else, and sets owner root, group lp.

This is allows sufficient privileges to p910nd
to do it's job.

Signed-off-by: Daniel F. Dickinson <cshored@thecshore.com>

Signed-off-by: Philipp Kerling <pkerling@casix.org>

Delay startup of p910nd to give devices more time to enumerate
Fixes issue #4752

Tested on mir3g
Signed-off-by: Francesco Molitierno <francyesc0@hotmail.it>

Signed-off-by: Maximilian Mehnert <maximilian.mehnert@gmx.de>
[pkerling@casix.org: increase PKG_RELEASE version]
Signed-off-by: Philipp Kerling <pkerling@casix.org>

Signed-off-by: Philipp Kerling <pkerling@casix.org>