LU-8410 ldiskfs: new FIEMAP API

LU-8410 ldiskfs: new FIEMAP API

With RH 6.5 old API was deprecated and was removed.
Backport a new API from ext4 upstream in opposite to copy-paste
older buggy code as FIEMAP now uses in current code.

Kernel upstream commit is 91dd8c114499e9818f2d5919ef0b9eee61810220
ext4: prevent race while walking extent tree for fiemap.

Signed-off-by: Alexey Lyashkov <alexey.lyashkov@seagate.com>
Change-Id: I7790c9e1a9cbfbd2cc429292aa764250e0525e21
Reviewed-on: http://review.whamcloud.com/21603
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Faccini Bruno <bruno.faccini@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>