Fix #2427, Race condition in TestCreateChild

[dmknutsen]

Checklist (Please check before submitting)

• [x ] I reviewed the Contributing Guide.
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Describe the contribution
Correct race condition in TestCreateChild by reducing the step size.

• Fixes Race condition in TestCreateChild #2427

Testing performed
Steps taken to test the contribution:

1. Tested updated functional test against Linux and VxWorks and confirmed that the test passes on both systems.

Expected behavior changes
A clear and concise description of how this contribution will change behavior and level of impact.

• API Change: xxx (if applicable)
• Behavior Change: xxx (if applicable)
• Or no impact to behavior

System(s) tested on

• VM & SP0
• OS: Linux & VxWorks

Contributor Info - All information REQUIRED for consideration of pull request
Dan Knutsen
NASA Goddard