Removing unused 'simple_block' package

web/modules/simple_block/tests/modules/simple_block_test/simple_block_test.info.yml

-type: module
-name: 'Simple Block Test'
-description: 'Simple Block testing module.'
-# core: 8.x
-# version: VERSION
-package: Testing
-dependencies:
-  - simple_block
-
-# Information added by Drupal.org packaging script on 2017-01-26
-version: '8.x-1.0-beta1'
-core: '8.x'
-project: 'simple_block'
-datestamp: 1485418688