Ensure manage_vms passes

[jonathanmetzman]

Last one failed with

Traceback (most recent call last):
  File "/mnt/scratch0/clusterfuzz/src/python/bot/startup/run_cron.py", line 67, in <module>
    sys.exit(main())
  File "/mnt/scratch0/clusterfuzz/src/python/bot/startup/run_cron.py", line 63, in main
    return 0 if task_module.main() else 1
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/cron/manage_vms.py", line 781, in main
    manager.update_clusters()
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/cron/manage_vms.py", line 379, in update_clusters
    high_end_project_infos, cluster)
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/cron/manage_vms.py", line 685, in update_project_cpus
    self.assign_hosts_to_workers(self.worker_to_assignment[cluster.name])
  File "/mnt/scratch0/clusterfuzz/src/clusterfuzz/_internal/cron/manage_vms.py", line 728, in assign_hosts_to_workers
    if host_cluster.gce_zone != worker_cluster.gce_zone:
AttributeError: 'NoneType' object has no attribute 'gce_zone'

[vitorguidi]

This LoC erroring out depends solely on the clusterfuzz-config files being loaded improperly Managed to run manage_vms locally with a debugger (unfortunately it broke before completing bc of some weird ssh error), and these LoC did not error out

[vitorguidi]

I landed this commit from the 3.7 branch and we are apparently through zone8 :shrug:

[vitorguidi]

Does not seem broken anymore