Nightly 05/01/18 suite setup failed: No keyword with name 'Deploy Nimbus NFS Datastore' found

Nightly 05/01/18, VC 6.0
Test suites: 5-4-High-Availability and 5-5-Heterogeneous-ESXi

```
Parent suite setup failed: No keyword with name 'Deploy Nimbus NFS Datastore' found.
```

Link to log: https://storage.cloud.google.com/vic-ci-logs/vic_nightly_logs_2018-05-01-20-32-56.zip?authuser=1

Cc: @mhagen-vmware 