contrib/nitester: each worker us its own copy of the Nit repository

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
nitester-wrapper: only compile nitg and nitester on the host processor

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
nitester-wrapper: fix set -x

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
misc/jenkins: unitrun without --quiet do not use ' for turing

Signed-off-by: Alexis Laferrière <alexis.laf@xymus.net>
tests: blacklist longer tests from nitg-g

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