message: PF4 update allows 'logout' when using anonymous login
diff: @@ -105,8 +105,10 @@ class UserDropdownConnected extends React.Component<UserProps, UserState> {
  render() {
  const { isDropdownOpen } = this.state;
  + const isAnonymous = authenticationConfig.strategy === AuthStrategy.anonymous;
  +
  const userDropdownItems = (
  - <DropdownItem key={'user_logout_option'} onClick={this.handleLogout}>
  + <DropdownItem key={'user_logout_option'} onClick={this.handleLogout} isDisabled={isAnonymous}>
  Logout
  </DropdownItem>
  );
  