code: public Observable<Page<VirtualMachineScaleSetInner>> listAsync() {
          return listWithServiceResponseAsync()
              .map(new Func1<ServiceResponse<Page<VirtualMachineScaleSetInner>>, Page<VirtualMachineScaleSetInner>>() {
                  @Override
                  public Page<VirtualMachineScaleSetInner> call(ServiceResponse<Page<VirtualMachineScaleSetInner>> response) {
                      return response.body();
                  }
              });
      }
docs: Gets a list of all VM Scale Sets in the subscription, regardless of the associated resource group. Use nextLink property in the response to get the next page of VM Scale Sets. Do this till nextLink is null to fetch all the VM Scale Sets.
  
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the PagedList&lt;VirtualMachineScaleSetInner&gt; object