code: public Observable<ConnectionResetSharedKeyInner> beginResetSharedKeyAsync(String resourceGroupName, String virtualNetworkGatewayConnectionName, int keyLength) {
          return beginResetSharedKeyWithServiceResponseAsync(resourceGroupName, virtualNetworkGatewayConnectionName, keyLength).map(new Func1<ServiceResponse<ConnectionResetSharedKeyInner>, ConnectionResetSharedKeyInner>() {
              @Override
              public ConnectionResetSharedKeyInner call(ServiceResponse<ConnectionResetSharedKeyInner> response) {
                  return response.body();
              }
          });
      }
docs: The VirtualNetworkGatewayConnectionResetSharedKey operation resets the virtual network gateway connection shared key for passed virtual network gateway connection in the specified resource group through Network resource provider.
  
  @param resourceGroupName The name of the resource group.
  @param virtualNetworkGatewayConnectionName The virtual network gateway connection reset shared key Name.
  @param keyLength The virtual network connection reset shared key length, should between 1 and 128.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the ConnectionResetSharedKeyInner object