3996 want a libzfs_core API to rollback to latest snapshot
Reviewed by: Christopher Siden <christopher.siden@delphix.com>
Reviewed by: Adam Leventhal <ahl@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>

@@ -263,11 +263,11 @@
 int dsl_dataset_snap_lookup(dsl_dataset_t *ds, const char *name,
     uint64_t *value);
 int dsl_dataset_snap_remove(dsl_dataset_t *ds, const char *name, dmu_tx_t *tx);
 void dsl_dataset_set_refreservation_sync_impl(dsl_dataset_t *ds,
     zprop_source_t source, uint64_t value, dmu_tx_t *tx);
-int dsl_dataset_rollback(const char *fsname, void *owner);
+int dsl_dataset_rollback(const char *fsname, void *owner, nvlist_t *result);
 
 #ifdef ZFS_DEBUG
 #define dprintf_ds(ds, fmt, ...) do { \
         if (zfs_flags & ZFS_DEBUG_DPRINTF) { \
         char *__ds_name = kmem_alloc(MAXNAMELEN, KM_SLEEP); \