Support  installing sphinx for upstream debian package

This PR add supports installing sphinx from upstream debian package, just select `install_method` and `version` node attributes:

```ruby
default_attributes({
  'sphinx' => {
    'version' => '2.1.9',
    'install_method' => 'debian_package'
  }
})
```
It was failing me as `fauxhai` 2.2.0 seems not to include `7.6.json` https://github.com/customink/fauxhai/tree/v2.2.0/lib/fauxhai/platforms/debian