code: public Observable<List<KeyVaultKeyInner>> listKeyVaultKeysAsync(String resourceGroupName, String integrationAccountName, ListKeyVaultKeysDefinition listKeyVaultKeys) {
          return listKeyVaultKeysWithServiceResponseAsync(resourceGroupName, integrationAccountName, listKeyVaultKeys).map(new Func1<ServiceResponse<List<KeyVaultKeyInner>>, List<KeyVaultKeyInner>>() {
              @Override
              public List<KeyVaultKeyInner> call(ServiceResponse<List<KeyVaultKeyInner>> response) {
                  return response.body();
              }
          });
      }
docs: Gets the integration account's Key Vault keys.
  
  @param resourceGroupName The resource group name.
  @param integrationAccountName The integration account name.
  @param listKeyVaultKeys The key vault parameters.
  @throws IllegalArgumentException thrown if parameters fail the validation
  @return the observable to the List&lt;KeyVaultKeyInner&gt; object