Add project ID support for chattr/lsattr

Chattr and lsattr can be used to set or get project ID:
chattr -p <project id> file
lsattr -p file

Signed-off-by: Li Xi <lixi@ddn.com>
Signed-off-by: Wang Shilong <wshilong@ddn.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
6 files changed