LU-2482 layout: introduce new layout for released files

Released files now have a standard layout (with generation, pool, ...)
and a stripe count 0 and lmm_pattern flag LOV_PATTERN_F_RELEASED.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Johann Lombardi <johann.lombardi@intel.com>
Change-Id: Id2c3b95fdd304f803d391281a86927f5c93cb3b4
Reviewed-on: http://review.whamcloud.com/4816
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Tested-by: Hudson
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
LU-2782 mdt: add macros for fid string len

add 2 macros for the length of a fid string 0xSEQ:0xOID:0xVER
and it's brace version (FID_NOBRACE_LEN, and FID_LEN)

Signed-off-by: JC Lafoucriere <jacques-charles.lafoucriere@cea.fr>
Change-Id: If257b7e12f43ea48bbdf6a6788d285d465c6a1bc
Reviewed-on: http://review.whamcloud.com/5299
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>