Add Unit tests that check the change of values in sub-resources.

[HoustonPutman]

We currently have fairly good testing around creating new Solr Clouds & Prometheus Exporters. However, the unit tests do not check that values of dependent resources are correctly updated when the Spec of a cloud/exporter is changed.

Desired Solution
Have some tests that make sure that a cloud is set up correctly, then make sure that when values are changed, the underlying kubernetes state changes along with it.