Fix for Rocoto streq dependencies.

[christinaholtNOAA]

Synopsis

Fixes a bug associated with using the Rocoto streq dependency. When specifying the schema-approved YAML option for the dependency as in this very abbreviated example:

rocoto:
  task:
    dependency:
      streq:
        left: foo
        right: bar

The resulting XML is invalid against the Rocoto RelaxNG schema:

<streq/>

And should appear as:

<streq/>
  <left>foo</left>
  <right>bar</right>
<streq/>

To fix future instances of similar failures, I added validation checks to each config object used to test the rocoto mechanics.

Type

• Bug fix (corrects a known issue)
• Code maintenance (refactoring, etc. without behavior change)
• Documentation
• Enhancement (adds new functionality)
• Tooling (CI, code-quality, packaging, revision-control, etc.)

Impact

• This is a breaking change (changes existing functionality)
• This is a non-breaking change (existing functionality continues to work as expected)

Checklist

• I have added myself and any co-authors to the PR's Assignees list.
• I have reviewed the documentation and have made any updates necessitated by this change.