E2e rx disk size

Closes https://github.com/rackerlabs/encore-ui/issues/322
The reason I'm reimplementing the logic here is because when it comes time to make sure that the UI is properly sorting the table column with this data

```js
['10 GB', '100 GB', '1.2 PB', '1300 TB'].sort()
```

this obviously won't be correct. The only option they'll have is to roll their own "reverse filter" function. Having three or four teams each doing it their own way will have a much higher risk of introducing bugs into the codebase than one function (that gets double and triple checked on every pull request made against the filter logic itself).