minitest errors out and returns 0 due to ldap_fluff.yml not being readable

Since https://github.com/Katello/katello/pull/1946, minitest has just been erroring out and returning 0 (which makes the Travis PRs seem to pass). Here is an example build:

https://travis-ci.org/Katello/katello/jobs/6596247

You can see that the last line was the following instead of it showing how many tests ran and how many results there were. Moreover, there were errors and failures.

```
The /etc/ldap_fluff.yml config file you specified is not readable
```

Here is the first job on master that this started happening:

https://travis-ci.org/Katello/katello/builds/6546196