def parse_list_server_lines(lines)
      result = Array.new
      lines.each do |l|
        result << l.split("-")[0].strip
      end
      return result
    end
def parse_list_server_lines(lines)
      result = Array.new
      lines.each do |l|
        result << l.split("-")[0].strip
      end
      return result
    end
Parses lines reported by barman's `list-server`
 @param [Array<String>] lines an array of lines from output of barman's `list-server` cmd
 @return [Array<String>] an array of server names