`acceleratorconfig` and `acceleratorrdma` suites both fail due it defaulting to `n1-standard-1`

I've added example logs of both suites here for completeness, but I believe it's simply a case of forcing the relevant machine types for these two suites (or having an accelerator-specific `DefaultMachineType` override value in `fixtures.go`).

##### `acceleratorrdma`
```

```

##### `acceleratorconfig`
```

```