[FrameworkBundle] Enable possibility to run PHP bultin server in production env
merged branch canni/prod_server (PR #7507)

This PR was squashed before being merged into the master branch (closes #7507).

Discussion
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[FrameworkBundle] Enable possibility to run PHP bultin server in production env

See the referenced ticket for discussion;

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7430
| License       | MIT

Commits
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12fce13 [FrameworkBundle] Enable possibility to run PHP bultin server in production env