tests: add a skip list for testing on the Turing cluster

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
nitester-wrapper: update script to follow the config of jenkins on pratchett

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
nitester-wrapper: test if the target hash is valid

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
nitester: use turing skip list

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
lib/string: chomp do not try to chomp empty strings

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>