MiniYARNCluster is showing multiple Failed to instantiate default resource calculator warning messages.

Whenever I try to start a MiniYARNCluster on Branch-2 (commit #0b61cca), I see multiple stack traces warning me that a resource calculator plugin could not be created

(ResourceCalculatorPlugin.java:getResourceCalculatorPlugin(184)) - java.lang.UnsupportedOperationException: Could not determine OS: Failed to instantiate default resource calculator.
java.lang.UnsupportedOperationException: Could not determine OS

This is a minicluster. It doesn't need resource calculation. It certainly doesn't need test logs being cluttered with even more stack traces which will only generate false alarms about tests failing.

There needs to be a way to turn this off, and the minicluster should have it that way by default.

Being ruthless and marking as a blocker, because its a fairly major regression for anyone testing with the minicluster.