Kernel modules don't have separate global space

This means that urt_global_* variables need initialization once and by
the main kernel module alone.  The others just ignore it.

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>
Add check target for kernel tests

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>