docs: def update_dvportgroup(portgroup_ref, spec):
      '''
      Updates a distributed virtual portgroup
  
      portgroup_ref
          The portgroup reference
  
      spec
          Portgroup spec (vim.DVPortgroupConfigSpec)
      '''
      pg_name = get_managed_object_name(portgroup_ref)
      log.trace('Updating portgrouo %s', pg_name)
      try:
          task = portgroup_ref.ReconfigureDVPortgroup_Task(spec)
      except vim.fault.NoPermission as exc:
          log.exception(exc)
          raise salt.exceptions.VMwareApiError(
              'Not enough permissions. Required privilege: '
              '{0}'.format(exc.privilegeId))
      except vim.fault.VimFault as exc:
          log.exception(exc)
          raise salt.exceptions.VMwareApiError(exc.msg)
      except vmodl.RuntimeFault as exc:
          log.exception(exc)
          raise salt.exceptions.VMwareRuntimeError(exc.msg)
      wait_for_task(task, pg_name, six.text_type(task.__class__))