Do not leak scheduler/scheduler.hh out of userver.hh
Do not leak scheduler/scheduler.hh out of userver.hh

	* include/kernel/userver.hh: Include "scheduler/fwd.hh" instead of
	"scheduler/scheduler.hh".

urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,urbiforge/urbi,aldebaran/urbi,aldebaran/urbi