code: public ServiceFuture<List<CloudJobSchedule>> listAsync(final ListOperationCallback<CloudJobSchedule> serviceCallback) {
          return AzureServiceFuture.fromHeaderPageResponse(
              listSinglePageAsync(),
              new Func1<String, Observable<ServiceResponseWithHeaders<Page<CloudJobSchedule>, JobScheduleListHeaders>>>() {
                  @Override
                  public Observable<ServiceResponseWithHeaders<Page<CloudJobSchedule>, JobScheduleListHeaders>> call(String nextPageLink) {
                      return listNextSinglePageAsync(nextPageLink, null);
                  }
              },
              serviceCallback);
      }
docs: Lists all of the job schedules in the specified account.
  
  @param serviceCallback the async ServiceCallback to handle successful and failed responses.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the {@link ServiceFuture} object