LU-540 remove file flags definition conflict between 1.8 and 2.x

LU-540 remove file flags definition conflict between 1.8 and 2.x

There is file flags definition conflict between 1.8 "LL_FILE_LOCKED_DIRECTIO"
and 2.x "LL_FILE_RMTACL". Redefine the later one to erase such conflict.

Change-Id: I1f4b96382f865f8548bf1a54fb1c74d3649b0daf
Signed-off-by: nasf <yong.fan@whamcloud.com>
Reviewed-on: http://review.whamcloud.com/1159
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Johann Lombardi <johann@whamcloud.com>