ENH: test_clean_warn options

[jklenzing]

Description

pysat 3.2.0 has the ability to test for clean warnings. There are still issues with the implementation, so not fully implemented here yet.

Potential impact

• Is the feature related to an existing problem?
  • Yes
• How critical is this feature to your workflow?
  • Minimal, but should be examined for best testing practices
• How wide of an impact to you anticipate this enhancement having?
  • Makes the tests longer
• Would this break any existing functionality?
  • No

Potential solution(s)

Add _clean_warn flags to instruments. Unit tests in pysat need a bug fix first.

Alternatives

Less testing

Additional context

Waiting on fixes for pysat/pysat#1196, as well as general streamline of tests. ICON FUV currently has an HDF issue when these tests are run.