private boolean cleanParent(final RegionInfo parent, Result rowContent) throws IOException {
    return cleanParent(services, parent, rowContent);
  }
If daughters no longer hold reference to the parents, delete the parent.
@param parent     RegionInfo of split offlined parent
@param rowContent Content of <code>parent</code> row in <code>metaRegionName</code>
@return True if we removed <code>parent</code> from meta table and from the filesystem.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/janitor/CatalogJanitor.java