Fix #373, Optionally move files when complete

[skliper]

Checklist (Please check before submitting)

• [x] I reviewed the Contributing Guide.
• [x] I signed and emailed the appropriate Contributor License Agreement to GSFC-SoftwareRelease@mail.nasa.gov and copied cfs-program@lists.nasa.gov.

Describe the contribution Most trivial implementation I could think of. Just adds entry to the table, if it's filled in moves the file instead of delete, falls back to a delete if the mv fails. This moves on every TX complete for all styles... good enough for our required use-case but may not work for everyone. If the use case is to support either move or delete, you can set up two channels (one w/ the move dir defined).

• Fix #373

Testing performed Tested use case in project code. CI (updated unit tests)

Expected behavior changes If move_dir is filled it, attempts to move instead of remove (remove is performed if move fails).

System(s) tested on Ubuntu 20.04

Additional context None

Third party code None

Contributor Info - All information REQUIRED for consideration of pull request Jacob Hageman - NASA/GSFC

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Note - retains default behavior if users don't update tables (zero fill).

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Added in placeholders to the table file, note if an old version is used it's zero fill so no real impact. This is more just to show the option.

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Simplified empty string check, just check first char.