Increase low disk space threshold from 2 to 5 GB. (#1579)
Increase low disk space threshold from 2 to 5 GB. (#1579)

* Increase low disk space threshold from 2 to 5 GB.

* Change log message to warning as it is not really an error.
google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz,google/clusterfuzz