make it possible to ignore route attributes in the RedirectContoller
inject the Request via the action signature, rather than fetching it from the DIC
add unit tests for $ignoreAttributes
merged branch lsmith77/redirect_controller (PR #7590)

This PR was merged into the master branch.

Discussion
----------

make it possible to ignore route attributes in the RedirectContoller

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

```
_welcome:
    pattern: /{path}
    defaults:
        _controller: FrameworkBundle:Redirect:redirect
        route: licenses_projects
        ignoreAttributes: true
    requirements:
        path: .*
```

or

```
_welcome:
    pattern: /{path}
    defaults:
        _controller: FrameworkBundle:Redirect:redirect
        route: licenses_projects
        ignoreAttributes: [path]
    requirements:
        path: .*
```

Ensures that ``path`` isnt added as a GET parameter in case the ``licenses_projects`` doesnt have a path in the pattern.

Commits
-------

190abc1 add unit tests for $ignoreAttributes
0c7b65f inject the Request via the action signature, rather than fetching it from the DIC
49062aa make it possible to ignore route attributes in the RedirectContoller