dwke: write all content to a .kpr at once

do not keep the file open and partially written while parsing the logfile

Signed-off-by: Andreas Beckmann <anbe@debian.org>
dwke: classify unclassified failures as unclassified_failures.conf

Signed-off-by: Andreas Beckmann <anbe@debian.org>
known_problems: add dummy unclassified_failures.conf

Signed-off-by: Andreas Beckmann <anbe@debian.org>
p-r: don't build the list of unknown failures

Signed-off-by: Andreas Beckmann <anbe@debian.org>
p-r: update_tpl(): do not create .tpl file

Signed-off-by: Andreas Beckmann <anbe@debian.org>