Parallelize integration tests using profiles support

Ensure that we don't break profiles support by running them simultaneously:

```
minikube start -p test1
minikube start -p test2
minikube ssh -p test1 hostname # assert that it says test1
minikube ssh -p test2 hostname # assert that it says test2
minikube delete -p test1
minikube delete -p test2
```
