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>

module/zfs/zfs_znode.c

@@ -384,6 +384,14 @@ zfs_get_zplprop(objset_t *os, zfs_prop_t prop, uint64_t *value)
 			*value = ZFS_ACLTYPE_OFF;
 #endif
 			break;
+		case ZFS_PROP_DEFAULTUSERQUOTA:
+		case ZFS_PROP_DEFAULTGROUPQUOTA:
+		case ZFS_PROP_DEFAULTPROJECTQUOTA:
+		case ZFS_PROP_DEFAULTUSEROBJQUOTA:
+		case ZFS_PROP_DEFAULTGROUPOBJQUOTA:
+		case ZFS_PROP_DEFAULTPROJECTOBJQUOTA:
+			*value = 0;
+			return (0);
 		default:
 			return (error);
 		}