LU-9842 osd: return ENODATA for XATTR_NAME_FID on MDT

LU-9842 osd: return ENODATA for XATTR_NAME_FID on MDT

The XATTR_NAME_FID xattr is OST side EA, if someone calls
getxattr() for XATTR_NAME_FID on MDT, then return -ENODATA.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I18b1466cf62d10fa28f7ed9731490e963b6274f4
Reviewed-on: https://review.whamcloud.com/28434
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>