Completes CIDEVSA-450 resource monitor refactoring

https://jira.oceanobservatories.org/tasks/browse/CIDEVSA-450

*NOTE*: This task targets version 2.1 but I don't yet see such branch so I'm making the PR against coi-services's master to let the reviewing process continue. Just let me know if I need to create a different pull request.

Thanks,
-carlos