Add ES application control API functional tests

[skliper]

Is your feature request related to a problem? Please describe.
Need open source functional tests for certifiability

Describe the solution you'd like
Add functional tests for cFE Application Control APIs
– CFE_ES_RestartApp - Restart a single cFE Application.
– CFE_ES_ReloadApp - Reload a single cFE Application.
– CFE_ES_DeleteApp - Delete a cFE Application.

Describe alternatives you've considered
N/A

Additional context
N/A

Requester Info
Jacob Hageman - NASA/GSFC

[nmullane]

I'll start working on this.