[HttpKernel] added an analyze of environment parameters for built-in server.
bug #10914 [HttpKernel] added an analyze of environment parameters for built-in server (mauchede)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes #10914).

Discussion
----------

[HttpKernel] added an analyze of environment parameters for built-in server

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | no
| Fixed tickets | #10208
| License       | MIT
| Doc PR        | -

With the built-in server, it is not possible to use the external parameters: environment variables are only in `$_ENV`.

Commits
-------

696b978 [HttpKernel] added an analyze of environment parameters for built-in server.