tests: kill_functions.sh needs gawk (skip if sourced)

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
tests: fix kill problems

There were several failures (missing tmp files, missing pids) on travis
build farm which I couldn't track down completely. Here we fix some
possible issues:
 - mktemp -u is unsafe, maybe even in practice if there is a bad random
   generator
 - make sure that mktemp does not give us pure integer filnames which
   would not work for "kill by-name"
 - avoid using trap, could be that it removed tmp files on wrong signals

Signed-off-by: Ruediger Meier <ruediger.meier@ga-group.nl>
Merge branch 'kill-tests' of https://github.com/rudimeier/util-linux
column: inform user when multibyte conversion error occurs

The column(1) read input until conversion error, and used incomplete
input when outputing, that made at least me to wonder where the rest
disappeared without explanation.  IMHO it is better to fail immediately
rather than do only half of the task.

Signed-off-by: Sami Kerola <kerolasa@iki.fi>