Go ahead and move the FIPS job to CentOS 9; there doesn't seem to be
much value in having more than one FIPS job.
Change-Id: I8c2c95e490ec083116f2ed7b9fb0d66918424fb7
Add the unittests in-tree and convert them as Zuul v3 native tests so
that they can be modified locally.
This adds a new job running on Ubuntu and an experimental CentOS-7 one.
Change-Id: Ib43e40280411623fda84f2068958b64a17cdc3dc