code: public Observable<CertificateBundle> deleteCertificateAsync(String vaultBaseUrl, String certificateName) {
          return deleteCertificateWithServiceResponseAsync(vaultBaseUrl, certificateName).map(new Func1<ServiceResponse<CertificateBundle>, CertificateBundle>() {
              @Override
              public CertificateBundle call(ServiceResponse<CertificateBundle> response) {
                  return response.body();
              }
          });
      }
docs: Deletes a certificate from a specified key vault.
  
  @param vaultBaseUrl The vault name, for example https://myvault.vault.azure.net.
  @param certificateName The name of the certificate.
  @return the observable to the CertificateBundle object