Fix split-vars tests

[ceblanton]

Description
The new split-ncvars tests cannot find the just-built script and executable location.

This resolves that problem and does not add any new functionality.

Fixes #353

How Has This Been Tested?
Hand-tested, and CI tests will pass

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes

[ceblanton]

@underwoo , @mlee03 I'm sorry for merging #354 despite its failing tests. This PR fixes the tests.

[mlee03]

@underwoo, a quick review please :)

[underwoo]

I cannot approve this PR until the items identified are fixed.

I suggest working with PR #338, and adding any adjustments off that PR. We need to get that PR approved and in place.

[underwoo]

These should be added to the Makefile.am where the test environment is defined, not here.

[underwoo]

This is true for all other files.

PR #338 has a fix for the PKGLIBEXECDIR. Please work to have that merged as well.

[underwoo]

A test scripot is required to ensure this line does what you expect.

Also, only testing if the file exists is not sufficient. You do need to verify the command runs. It would be easier to verify that the command ran successfully in the location where the command is run in this script than just trying to figure out if the command exits and is executable.

[ceblanton]

Thank you very much. I that checking the exit status would be better than this check, and I'll do that in a separate PR.

[ceblanton]

#338 resolves the split-vars test failures in a far better way, so closing this with prejudice.