Unit tests for cluster overrides

[jayanth-tjvrr]

There is a requirement to add unit tests for the recently added cluster overrides feature. Unit tests have already been added to most of the parts like pkg/cluster, pkg/profiles etc in the arlon project. These unit tests can be taken as reference for unit test of cluster overrides

Aha! Link: https://pf9.aha.io/features/ARLON-377

[cruizen]

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