paragonie/random_compat filesystem changed, vendorTestCodeCleanup is out of date

Problem/Motivation

In the current version of Drupal 8.1.x, (3ad9f73be798f1e0fed0914a522d696b230139a2) composer.lock has paragonie/random_compat at v.1.1.1.

If you perform composer update, you'll see that paragonie/random_compat is updated to v.1.2.0.

This prevents Composer from completing its installation because our test code cleanup attempts to remove a test/ directory that is not present in v.1.2.0.

Proposed resolution

• Pin paragonie/random_compat to ~1.2 in composer.json.
• Remove paragonie/random_compat's test directory from the list of directories to remove in the composer hook.

Remaining tasks

User interface changes

API changes

Data model changes