Merged:

https://review.opendev.org/#/c/702300/ Introduces 62 new unit tests to cover sysinv network api

In Review:

https://review.opendev.org/#/c/702975/  Introduces 20 new unit tests to cover sysinv oam network api

https://review.opendev.org/#/c/703212/  Introduces 14 new unit tests to cover sysinv address api

Issues uncovered:

https://bugs.launchpad.net/starlingx/+bug/1859855

https://bugs.launchpad.net/starlingx/+bug/1860176

https://bugs.launchpad.net/starlingx/+bug/1860186