LU-5405 llog: add newly opened llog at tail of handle list

LU-5405 llog: add newly opened llog at tail of handle list

Add newly opened llog handle at the tail of handle list to increase
lookup speed, especially for cancel operation, because the canceled
log will be removed from the list, and lookup is from the beginning.

Signed-off-by: Lai Siyao <lai.siyao@intel.com>
Signed-off-by: Li Xi <lixi@ddn.com>
Change-Id: I4c5c22901ea5818a8ee50ef97d6dabe4839b9a74
Reviewed-on: http://review.whamcloud.com/11575
Tested-by: Jenkins
Reviewed-by: Ian Costello <costello.ian@gmail.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Mike Pershin <mike.pershin@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Conflicts:
	lustre/obdclass/llog_cat.c