Comment 8 for bug 2072550

Tests ran :
- IPMI credentials set in inspector.yml don't appear in the introspection rule for default IPMI credentials during playbook execution (`kayobe seed service deploy && kayobe seed deployment image build --force-rebuild`)
- the same credentials set in bifrost.yml do appear in the introspection rule during playbook execution
      In either cases, the credentials don't appear in the node driver_info.

Methodology used to re-trigger discovery and introspection of nodes :
- powering off the nodes
- deleting them in Bifrost/Ironic (baremetal node delete)
- running `kayobe seed service destroy`
- running `ipmitool -I lanplus chassis bootdev pxe` on all the nodes BMC (to be 100% sure they PXEboot)
- running `kayobe seed service deploy`
- powering on the nodes