Categorize (add fieldset) the items in the Cloud Provider configuration page

@xiaohua-guan,

Thank you for the patch！ Could I ask you to re-order the items as follows? And also, please remove Eucalyptus from Cloud Type options.

    [
      'name' => 'cloud_provider',
      'title' => t('Cloud Provider'),
      'open' => TRUE,
      'fields' => [
        'cloud_context',
        'name',
        'field_description',
      ],
    ],
    [
      'name' => 'credentials',
      'title' => t('Credentials'),
      'open' => TRUE,
      'fields' => [
        'field_cloud_type',
        'field_region',
        'field_access_key',
        'field_secret_key',
        'field_user_id',
      ],
    ],
    [
      'name' => 'api',
      'title' => t('API'),
      'open' => TRUE,
      'fields' => [
        'field_api_version',
        'field_api_endpoint_uri',
      ],
    ],
    [
      'name' => 'image_upload',
      'title' => t('Image Upload'),
      'open' => TRUE,
      'fields' => [
        'field_image_upload_url',
        'field_x_509_certificate',
      ],
    ],
  ];
  $others = [
    'name' => 'others',
    'title' => t('Others'),
    'open' => FALSE,
    'fields' => [
      'revision_log_message',
      'user_id',
    ],
  ];

@xiaohua-guan

Thank you for the update. It looks good to me.

@baldwinlouie

What do you think?

@yas, @xiaohua-guan, This patch looks good!

@baldwinlouie

Thank you for your review. Then I'll merge the patch and mark this issue as Fixed.