Check nodes/BMHs in IP-reuse e2e test

[lentzi90]

What steps did you take and what happened:

Currently the e2e test for IP-reuse is just checking the IPPool, not the nodes or BMHs.

What did you expect to happen:

We should extend the test to actually make sure that the IPAddresses are used, not just allocated in the IPPool. This may require a bit more changes to the tests actually, because I think we are currently only setting them in the metadata, not really using them in the networkdata.

Anything else you would like to add:

/kind feature

[Rozzii]

/triage accepted