updated: Replace problematic filename characters

If the name of the project contains spaces, the generated
/etc/apt/sources.list.d file will be silently ignored by APT, because
its name contains a space. For version numbers we have the same problem.
The fix is to replace all characters that are problematic in file names
(including spaces and slashes) by underscores.

Signed-off-by: Stefan Gast <stefan.gast@linutronix.de>
finetuning: add action for creating symlinks

Signed-off-by: Manuel Traut <manut@linutronix.de>
add xilinx zynq zedboard example

Signed-off-by: Manuel Traut <manut@linutronix.de>
finetuning: run commands in /bin/sh

without this change, the full path to the command needs to be specified
in the <command> tag

Signed-off-by: Manuel Traut <manut@linutronix.de>
examples: update zedboard example

 - use another kernel
 - remove documentation and man pages
 - enable root login on the serial terminal
 - auto configure eth0 with dhcp

Signed-off-by: Manuel Traut <manut@linutronix.de>