Fix failed tests for phar

Fix failed tests for phar

- when $status is boolean, E_NOTICE appears and tests fail
- opcache is never enabled on these tests anyway.
- Add opcache.revalidate_freq=0 to testing script

  Instead of checking this in the tests files it can be used directly in
  the main testing script. Also this fixes failed tests.

- Use opcache_invalidate() instead of sleep() delay in some tests. Some
  delays are still used since the opcache_invalidate seems to be buggy
  and not working as expected.

Closes GH-4392