Network v1 to ENI rendering uses `bond_miimon` rather than `bond-miimon`

[TheRealFalcon]

E.g., https://github.com/canonical/cloud-init/blob/3671caa2a6b7a971c3eb4ab6d6fcb17d3566b49f/tests/unittests/net/network_configs.py#L1333

I'd rather not xfail this test with the expected data because there's many other valuable things being tested here, and a broad xfail means we won't see that coverage if anything else changes.