private void setServerState(ServerName serverName, ServerState state) {
    ServerStateNode serverNode = getServerNode(serverName);
    synchronized (serverNode) {
      serverNode.setState(state);
    }
  }
Utility. Whether to include region in list of regions. Default is to weed out split and offline
regions.
@return True if we should include the <code>node</code> (do not include if split or offline
        unless <code>offline</code> is set to true.
hbase-server/src/main/java/org/apache/hadoop/hbase/master/assignment/RegionStates.java