refs #10168 - fix test that created a duplicate primary interface
Subtle interaction between 4d5b979 and a5dc3e2, resulting in the test that tried to add an interface to an unmanaged host duplicating the one that was automatically added.
Related issues
Bug #10168: Foreman names VM's incorrectly when using multiple nics for provisioning
refs #10168 - fix test that created a duplicate primary interface
Subtle interaction between 4d5b979 and a5dc3e2, resulting in the test
that tried to add an interface to an unmanaged host duplicating the one
that was automatically added.