symfony/console locked on 2.6

The required version for symfony/console for Magento 2 is `"symfony/console": "~2.3, !=2.7.0",`, which right now is at 2.6.3. To be able to use Sensiolab's [security-checker](https://github.com/sensiolabs/security-checker) version 4.0 and up, to be able to use with [GrumPHP](http://github.com/phpro/grumphp), we need at least 2.7. 

Right now we're stuck using version 3.0.2 of security-checker since that is the newest version compatible with symfony/console 2.6.x.

### Preconditions


1. Magento 2.1.5

### Steps to reproduce

1. Run `composer require sensiolabs/security-checker:^4.0`

### Expected result

1. It should install the security checker

### Actual result

1. 

```
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Conclusion: don't install sensiolabs/security-checker v4.0.1
    - Conclusion: remove symfony/console v2.6.13
    - Installation request for sensiolabs/security-checker ^4.0 -> satisfiable by sensiolabs/security-checker[v4.0.0, v4.0.1].
    - Conclusion: don't install symfony/console v2.6.13
    - sensiolabs/security-checker v4.0.0 requires symfony/console ~2.7|~3.0 -> satisfiable by symfony/console[v2.7.0, v2.7.0-BETA1, v2.7.0-BETA2, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.17, v2.7.18, v2.7.19, v2.7.2, v2.7.20, v2.7.21, v2.7.22, v2.7.23, v2.7.24, v2.7.3, v2.7.4, v2.7.5, v2.7.6, v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.0-BETA1, v2.8.1, v2.8.10, v2.8.11, v2.8.12, v2.8.13, v2.8.14, v2.8.15, v2.8.16, v2.8.17, v2.8.2, v2.8.3, v2.8.4, v2.8.5, v2.8.6, v2.8.7, v2.8.8, v2.8.9, v3.0.0, v3.0.0-BETA1, v3.0.1, v3.0.2, v3.0.3, v3.0.4, v3.0.5, v3.0.6, v3.0.7, v3.0.8, v3.0.9, v3.1.0, v3.1.0-BETA1, v3.1.0-RC1, v3.1.1, v3.1.10, v3.1.2, v3.1.3, v3.1.4, v3.1.5, v3.1.6, v3.1.7, v3.1.8, v3.1.9, v3.2.0, v3.2.0-BETA1, v3.2.0-RC1, v3.2.0-RC2, v3.2.1, v3.2.2, v3.2.3, v3.2.4].
    - Can only install one of: symfony/console[v2.7.0, v2.6.13].
    - Can only install one of: symfony/console[v2.7.0-BETA1, v2.6.13].
    - Can only install one of: symfony/console[v2.7.0-BETA2, v2.6.13].
    - Can only install one of: symfony/console[v2.7.1, v2.6.13].
    - Can only install one of: symfony/console[v2.7.10, v2.6.13].
    - Can only install one of: symfony/console[v2.7.11, v2.6.13].
    - Can only install one of: symfony/console[v2.7.12, v2.6.13].
    - Can only install one of: symfony/console[v2.7.13, v2.6.13].
    - Can only install one of: symfony/console[v2.7.14, v2.6.13].
    - Can only install one of: symfony/console[v2.7.15, v2.6.13].
    - Can only install one of: symfony/console[v2.7.16, v2.6.13].
    - Can only install one of: symfony/console[v2.7.17, v2.6.13].
    - Can only install one of: symfony/console[v2.7.18, v2.6.13].
    - Can only install one of: symfony/console[v2.7.19, v2.6.13].
    - Can only install one of: symfony/console[v2.7.2, v2.6.13].
    - Can only install one of: symfony/console[v2.7.20, v2.6.13].
    - Can only install one of: symfony/console[v2.7.21, v2.6.13].
    - Can only install one of: symfony/console[v2.7.22, v2.6.13].
    - Can only install one of: symfony/console[v2.7.23, v2.6.13].
    - Can only install one of: symfony/console[v2.7.24, v2.6.13].
    - Can only install one of: symfony/console[v2.7.3, v2.6.13].
    - Can only install one of: symfony/console[v2.7.4, v2.6.13].
    - Can only install one of: symfony/console[v2.7.5, v2.6.13].
    - Can only install one of: symfony/console[v2.7.6, v2.6.13].
    - Can only install one of: symfony/console[v2.7.7, v2.6.13].
    - Can only install one of: symfony/console[v2.7.8, v2.6.13].
    - Can only install one of: symfony/console[v2.7.9, v2.6.13].
    - Can only install one of: symfony/console[v2.8.0, v2.6.13].
    - Can only install one of: symfony/console[v2.8.0-BETA1, v2.6.13].
    - Can only install one of: symfony/console[v2.8.1, v2.6.13].
    - Can only install one of: symfony/console[v2.8.10, v2.6.13].
    - Can only install one of: symfony/console[v2.8.11, v2.6.13].
    - Can only install one of: symfony/console[v2.8.12, v2.6.13].
    - Can only install one of: symfony/console[v2.8.13, v2.6.13].
    - Can only install one of: symfony/console[v2.8.14, v2.6.13].
    - Can only install one of: symfony/console[v2.8.15, v2.6.13].
    - Can only install one of: symfony/console[v2.8.16, v2.6.13].
    - Can only install one of: symfony/console[v2.8.17, v2.6.13].
    - Can only install one of: symfony/console[v2.8.2, v2.6.13].
    - Can only install one of: symfony/console[v2.8.3, v2.6.13].
    - Can only install one of: symfony/console[v2.8.4, v2.6.13].
    - Can only install one of: symfony/console[v2.8.5, v2.6.13].
    - Can only install one of: symfony/console[v2.8.6, v2.6.13].
    - Can only install one of: symfony/console[v2.8.7, v2.6.13].
    - Can only install one of: symfony/console[v2.8.8, v2.6.13].
    - Can only install one of: symfony/console[v2.8.9, v2.6.13].
    - Can only install one of: symfony/console[v3.0.0, v2.6.13].
    - Can only install one of: symfony/console[v3.0.0-BETA1, v2.6.13].
    - Can only install one of: symfony/console[v3.0.1, v2.6.13].
    - Can only install one of: symfony/console[v3.0.2, v2.6.13].
    - Can only install one of: symfony/console[v3.0.3, v2.6.13].
    - Can only install one of: symfony/console[v3.0.4, v2.6.13].
    - Can only install one of: symfony/console[v3.0.5, v2.6.13].
    - Can only install one of: symfony/console[v3.0.6, v2.6.13].
    - Can only install one of: symfony/console[v3.0.7, v2.6.13].
    - Can only install one of: symfony/console[v3.0.8, v2.6.13].
    - Can only install one of: symfony/console[v3.0.9, v2.6.13].
    - Can only install one of: symfony/console[v3.1.0, v2.6.13].
    - Can only install one of: symfony/console[v3.1.0-BETA1, v2.6.13].
    - Can only install one of: symfony/console[v3.1.0-RC1, v2.6.13].
    - Can only install one of: symfony/console[v3.1.1, v2.6.13].
    - Can only install one of: symfony/console[v3.1.10, v2.6.13].
    - Can only install one of: symfony/console[v3.1.2, v2.6.13].
    - Can only install one of: symfony/console[v3.1.3, v2.6.13].
    - Can only install one of: symfony/console[v3.1.4, v2.6.13].
    - Can only install one of: symfony/console[v3.1.5, v2.6.13].
    - Can only install one of: symfony/console[v3.1.6, v2.6.13].
    - Can only install one of: symfony/console[v3.1.7, v2.6.13].
    - Can only install one of: symfony/console[v3.1.8, v2.6.13].
    - Can only install one of: symfony/console[v3.1.9, v2.6.13].
    - Can only install one of: symfony/console[v3.2.0, v2.6.13].
    - Can only install one of: symfony/console[v3.2.0-BETA1, v2.6.13].
    - Can only install one of: symfony/console[v3.2.0-RC1, v2.6.13].
    - Can only install one of: symfony/console[v3.2.0-RC2, v2.6.13].
    - Can only install one of: symfony/console[v3.2.1, v2.6.13].
    - Can only install one of: symfony/console[v3.2.2, v2.6.13].
    - Can only install one of: symfony/console[v3.2.3, v2.6.13].
    - Can only install one of: symfony/console[v3.2.4, v2.6.13].
    - Installation request for symfony/console (locked at v2.6.13) -> satisfiable by symfony/console[v2.6.13].


Installation failed, reverting ./composer.json to its original content.
```

### Workaround
1. Run `composer require sensiolabs/security-checker:^3.0`

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symfony/console locked on 2.6 #8738

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symfony/console locked on 2.6 #8738

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