[LTP] [PATCH v2 2/3] lib/cloner.c: Add tst_clone.h for new API

[Cyril Hrubis]

Hi!
> Make sure the functions from lib/cloner.c can be used by new API.

I've made use of the tst_clone.h in the test.h as well, since it does
not makes sense to keep two copies of the function prototypes and
pushed, thanks.

-- 
Cyril Hrubis
chrubis@suse.cz