Add default user/group/project quota properties

This adds default userquota, groupquota, and projectquota properties to
MASTER_NODE_OBJ to make them accessible during zfsvfs_init() (regular
DSL properties require dsl_config_lock, which cannot be safely acquired
in this context). The zfs_fill_zplprops_impl() logic is updated to read
these default properties directly from MASTER_NODE_OBJ.

Signed-off-by: Ameer Hamza <ahamza@ixsystems.com>

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Tony Hutter <hutter2@llnl.gov>

include/sys/fs/zfs.h

@@ -197,6 +197,12 @@ typedef enum {
 	ZFS_PROP_VOLTHREADING,
 	ZFS_PROP_DIRECT,
 	ZFS_PROP_LONGNAME,
+	ZFS_PROP_DEFAULTUSERQUOTA,
+	ZFS_PROP_DEFAULTGROUPQUOTA,
+	ZFS_PROP_DEFAULTPROJECTQUOTA,
+	ZFS_PROP_DEFAULTUSEROBJQUOTA,
+	ZFS_PROP_DEFAULTGROUPOBJQUOTA,
+	ZFS_PROP_DEFAULTPROJECTOBJQUOTA,
 	ZFS_NUM_PROPS
 } zfs_prop_t;