LU-1346 libcfs: cleanup libcfs primitive (linux-prim.h)

LU-1346 libcfs: cleanup libcfs primitive (linux-prim.h)

Affected primitives:

cfs_kthread_run, CFS_DAEMON_FLAGS, cfs_task_t, cfs_current,
cfs_task_lock, cfs_task_unlock, CFS_DECL_JOURNAL_DATA,
CFS_PUSH_JOURNAL, CFS_POP_JOURNAL, cfs_sigset_t,
cfs_timer_t, CFS_MAX_SCHEDULE_TIMEOUT

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Liu Xuezhao <xuezhao.liu@emc.com>
Signed-off-by: James Simmons <uja.ornl@gmail.com>
Change-Id: Iae0e9a9ccaa39fda71175205e9af451e65b620d1
Reviewed-on: http://review.whamcloud.com/6956
Tested-by: Hudson
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>