BOSH GCE: remove creds to regenerate
BOSH GCE: remove creds to regenerate

Certificates have expired.

```
Certificate:
    Data:
        Version: 3 (0x2)
        Serial Number:
            e6:f2:39:e7:50:12:d8:83:6b:38:c6:1f:38:63:2a:b5
    Signature Algorithm: sha256WithRSAEncryption
        Issuer: C=USA, O=Cloud Foundry, CN=ca
        Validity
            Not Before: Dec  5 21:02:18 2017 GMT
            Not After : Dec  5 21:02:18 2018 GMT
```

cunnie/deployments,cunnie/deployments