LU-10029 osd-ldiskfs: make project inherit attr removeable

LU-10029 osd-ldiskfs: make project inherit attr removeable

Inherit attribute should be clearable now

Lustre-change: https://review.whamcloud.com/29189
Lustre-commit: 9d068048603fefbab1eea8d8bb5a246ce4375dca

Signed-off-by: Wang Shilong <wshilong@ddn.com>
Change-Id: I878fde0dc134c9820436ee80979d87e6dacfb70d
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Li Xi <lixi@ddn.com>
Signed-off-by: Minh Diep <minh.diep@intel.com>
Reviewed-on: https://review.whamcloud.com/29688
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>