[HttpFoundation] fixed some volatile tests
minor #11966 [HttpFoundation] fixed some volatile tests (fabpot)

This PR was merged into the 2.3 branch.

Discussion
----------

[HttpFoundation] fixed some volatile tests

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | see #11588
| License       | MIT
| Doc PR        | n/a

Commits
-------

00c1b75 [Process] fixed some volatile tests
974bf01 [HttpKernel] fixed a volatile test
6020c43 [HttpFoundation] fixed some volatile tests