Added kernel tests (still missing new and inject).

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Fixed relative paths in devtools module.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>
Fixed minor bugs after kernel tests implementation.

Signed-off-by: marco.minetti <marco.minetti@novetica.org>