Update openmdao interface for WEIS

[dzalkind]

Purpose

These minor set of changes were made to run RAFT in WEIS. I added some scripting to save the inputs and options to the opendmao interface for testing exact WEIS configurations in RAFT; this was enabled as an official test in RAFT to see if future changes affect the openmdao interface, given a known example from WEIS.

Also some minor changes to the turbulence input processing.

Type of change

What types of change is it? Select the appropriate type(s) that describe this PR

• [ ] Bugfix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (non-backwards-compatible fix or feature)
• [ ] Code style update (formatting, renaming)
• [ ] Refactoring (no functional changes, no API changes)
• [ ] Documentation update
• [x] Maintenance update
• [ ] Other (please describe)

Testing

test_omdao_VolturnUS-S.py now tests the exact RAFT Volturnus example inputs in WEIS

Added a case to the VolturnUS-S_example.yaml to ensure that both floats (0.1 TI) and strings (IB) are acceptable case inputs for turbulence.

Checklist

Put an x in the boxes that apply.

• [x] I have run existing tests which pass locally with my changes
• [ ] I have added new tests or examples that prove my fix is effective or that my feature works
• [ ] I have added necessary documentation

[dzalkind]

@mattEhall, this is working nicely in WEIS and ready for review/merge