Exclude files in production

[vinkla]

This pull request excludes even more files which we don't need in production.

https://www.reddit.com/r/PHP/comments/2jzp6k/i_dont_need_your_tests_in_my_production/

[staabm]

Thx

[DominikTo]

I have no strong opinion about this, but it seems like the benefits are quite small - we save a few kilobytes.

But there seem to be some good arguments about drawbacks:

See e.g.:
symfony/symfony#6605

So, should we really do this?

[phil-davis]

This is "a good thing" in general. But note that the unit tests from here were being run in sabre-io/dav - the tests/phpunit.xml there had:

      <testsuite name="sabre-uir">
          <directory>../vendor/sabre/uri/tests/</directory>
      </testsuite>

But actually no tests appear there any more. So actually those tests have not been running in sabre-io/dav CI.

A new version of phpunit is now reporting when there is a test suite defined that does not exist. CI started failing in sabre-io/dav. See sabre-io/dav#1316