mount: Dump fstype

Encode it in u32 since we have to check filesystem name anyway
(not everyone ie easily migratable).

Dump _any_ root fs as we need the root entry on restore though
do not mount it then -- it should be provided before crtools
restore start.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/image.h

@@ -290,6 +290,7 @@ struct ipc_sem_entry {
 } __packed;
 
 struct mnt_entry {
+	u32	fstype;
 	u32	mnt_id;
 	u32	root_dev;
 	u32	root_dentry_len;