Allow checking kernel processes

[deribaucourt]

cukinia_process allows checking that a user process is running, however it explicitly doesn't allow testing kernel processes:

		# skip kernel threads
		[ -x $procdir/exe ] || continue

It can be legitimate to verify that some key kernel threads are running, for instance [watchdogd].

I suggest adding a cukinia_kprocess function dedicated to kernel processes.

[deribaucourt]

Merged