contrib: udev: modify rules for users physically in front of machine (TAG+="uaccess")

contrib: udev: modify rules for users physically in front of machine (TAG+="uaccess")

Modern desktop systems with systemd recommend this way to give users
access to devices. We change permissions to sane value along the way.

See e.g. https://lists.debian.org/debian-devel-announce/2016/11/msg00008.html

We also change the filename to put it in order with 71-seat.rules, 60
is default for dh_installudev so pick that as a reasonable value.

Change-Id: I15f6fb1b6be853ac097d0ca91955609f9e5eb9cf
Signed-off-by: Jiri Kastner <cz172638@gmail.com>
Reviewed-on: http://openocd.zylin.com/2804
Tested-by: jenkins
Reviewed-by: Robert Jordens <jordens@gmail.com>
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>