LU-4017 debugfs: add support for the project id field

LU-4017 debugfs: add support for the project id field

Pick from upstream commit: f3d9ac36a021aab3d84ef7759790839f9a65a1bf

Teach the stat and set_inode_field commands to support the project ID
field

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Change-Id: Ia633d9857b3026e50308d16a91bc81bde2f3d0da
Reviewed-on: http://review.whamcloud.com/21255
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>