Add missing use for @Cache annotations
minor #287 Add missing use for @Cache annotations in HttpCacheListener (pocky)

This PR was merged into the 3.0.x-dev branch.

Discussion
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Add missing use for @Cache annotations in HttpCacheListener

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

This patch will fix this error:
```bash
[Semantical Error] The annotation "@Cache" in class Sensio\Bundle\FrameworkExtraBundle\EventListener\HttpCacheListener was never imported. Did you maybe forget to add a "use" statement for this annotation?
```
I fix this like by adding the use statement like `Sensio\Bundle\FrameworkExtraBundle\EventListener\TemplateListener` but I don't know if it's not better to modify the docblock and add double quotes around the annotation.

Commits
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ac162b4 Add missing use for @Cache annotations