code: function normalizeService(service) {
    const api = service.api;
    Object.keys(api).forEach(function(key) {
      // 支持简化配置
      if (is.string(api[key])) {
        const strArr = api[key].split(':');
        api[key] = {
          interfaceName: strArr[0],
          version: strArr[1],
        };
      }
      const item = api[key];
      item.name = key;
      item.method = item.method || {};
  
    });
    return service;
  }
docs: api: {key: value} -> {key: {interface: value}}  dependency: {} -> [{}]
  @param  {Object} service    proxy config service
  @return {Object}         format service