public List<RegionInfo> getRegionsToAdd() {
      return this.regionsToAdd;
    }
Returns the list of new regions added during the on-disk restore. The caller is responsible
to add the regions to META. e.g MetaTableAccessor.addRegionsToMeta(...)
@return the list of regions to add to META
hbase-server/src/main/java/org/apache/hadoop/hbase/snapshot/RestoreSnapshotHelper.java