Enable unit test step in CI (DCNE-692)

[samiib]

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Description

Enabled the unit test step that is currently disabled. New unit tests are being added in #184.

Enable the step in https://github.com/CiscoDevNet/ansible-nd/tree/nd42_integration when PRs are merged in:

• Add Log class and logging config #184
• Add Smart Endpoints framework for ND API v1 #186
• Add RestSend framework, enums, and shared unit test infrastructure #185

NDA-1