def servers(opts = {})
      result = Servers.new
      lines = run_barman_command("list-server")
      server_names = parse_list_server_lines(lines)
      server_names.each do |name|
        result << server(name, opts)
      end
      return result
    end
def servers(opts = {})
      result = Servers.new
      lines = run_barman_command("list-server")
      server_names = parse_list_server_lines(lines)
      server_names.each do |name|
        result << server(name, opts)
      end
      return result
    end
Instructs barman to get information about all servers
 @param [Hash] opts options for creating {Servers}
 @option opts [Boolean] :with_backups whether to include {Backups}
 @option opts [Boolean] :with_wal_files whether to include {WalFiles}
 @return [Servers] an array of {Server}