Nightly 04/30/18 5-11-Multiple-Cluster: Create a Simple VC Cluster timed out

[AngieCris]

nightly 04/30/18
VC version: 6.0
Test suite: 5-11-Multiple-Cluster
Test step: Multiple Cluster Setup, Create a simple nimbus cluster

Link to download logs: https://storage.cloud.google.com/vic-ci-logs/vic_nightly_logs_2018-04-30-20-32-56.zip?authuser=1

Cc: @mhagen-vmware