Paul Banks ebbd11edbb
Actually add the require vendored files I intended to add in 0d5600ff60
Note that the vendor.json is already correct but the actual files were never checked in so report as missing:

```
$ govendor list | grep testify
 v  github.com/stretchr/testify/assert
  m github.com/stretchr/testify/require
```
2018-03-29 17:05:11 +01:00
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