[2.2.4-only] Stub RAIDZ enums to prevent conflicts

Stub in the RAIDZ expansions enums for now so that the slow IO
commit merges cleanly.

Signed-off-by: Tony Hutter <hutter2@llnl.gov>

include/libzfs.h

@@ -157,6 +157,7 @@ typedef enum zfs_error {
 	EZFS_CKSUM,		/* insufficient replicas */
 	EZFS_RESUME_EXISTS,	/* Resume on existing dataset without force */
 	EZFS_SHAREFAILED,	/* filesystem share failed */
+	EZFS_RAIDZ_EXPAND_IN_PROGRESS,	/* a raidz is currently expanding */
 	EZFS_UNKNOWN
 } zfs_error_t;
 

include/sys/fs/zfs.h

@@ -363,6 +363,7 @@ typedef enum {
 	VDEV_PROP_CHECKSUM_T,
 	VDEV_PROP_IO_N,
 	VDEV_PROP_IO_T,
+	VDEV_PROP_RAIDZ_EXPANDING,
 	VDEV_NUM_PROPS
 } vdev_prop_t;
 
@@ -1569,6 +1570,7 @@ typedef enum {
 	ZFS_ERR_NOT_USER_NAMESPACE,
 	ZFS_ERR_RESUME_EXISTS,
 	ZFS_ERR_CRYPTO_NOTSUP,
+	ZFS_ERR_RAIDZ_EXPAND_IN_PROGRESS,
 } zfs_errno_t;
 
 /*