code: function requestProvisionConfig (managementService, csr, verbosity, callback) {
    managementService.request('Requesting client certificate', PROVISION_COMMAND,
      {csrString: csr}, verbosity, callback)
  }
docs: Gets the provision configuration from the management service.
  @param {ManagementService} managementService - The management service
  instance.
  @param {String} csr - The CSR string to send to the management service for
  signing.
  @param {Number} verbosity - Level of verbosity at which to log any error
  or trace messages.
  @param {Function} callback - Callback to invoke with the configuration
  retrieved from the management service.
  @private