def node_from(node_string)
      return if node_string.nil?
      host, port = node_string.split(':', 2)
      Node.new(:host => host, :port => port, :password => @options[:password])
    end
def node_from(node_string)
      return if node_string.nil?
      host, port = node_string.split(':', 2)
      Node.new(:host => host, :port => port, :password => @options[:password])
    end
Creates a Node instance from a string.

 @param [String] node_string a string representation of a node (e.g., host:port)
 @return [Node] the Node representation