[RELOPS-2265] Linux: ignore secondary interface

[aerickson]

Found as part of https://mozilla-hub.atlassian.net/browse/RELOPS-2265.

Obvserved a hang for ~45 seconds a 2404 host when booting. It seems to be hanging waiting for an interface eno1d1. Checking out a 1804 system, NetworkManger isn't worried about it.

Make 2404 not worry about it also. Add a NetworkManager rule to ignore this secondary interface.

The rule seems to work fine in quick testing.

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[aerickson@t-linux64-ms-026 ~]$ sudo systemctl status NetworkManager-wait-online
× NetworkManager-wait-online.service - Network Manager Wait Online
     Loaded: loaded (/usr/lib/systemd/system/NetworkManager-wait-online.service; enabled; preset: enabled)
     Active: failed (Result: exit-code) since Wed 2026-03-11 22:25:30 UTC; 37s ago
       Docs: man:NetworkManager-wait-online.service(8)
    Process: 1323 ExecStart=/usr/bin/nm-online -s -q (code=exited, status=1/FAILURE)
   Main PID: 1323 (code=exited, status=1/FAILURE)
        CPU: 36ms

Mar 11 22:24:37 t-linux64-ms-026 systemd[1]: Starting NetworkManager-wait-online.service - Network Manager Wait Online...
Mar 11 22:25:30 t-linux64-ms-026 systemd[1]: NetworkManager-wait-online.service: Main process exited, code=exited, status=1/FAILURE
Mar 11 22:25:30 t-linux64-ms-026 systemd[1]: NetworkManager-wait-online.service: Failed with result 'exit-code'.
Mar 11 22:25:30 t-linux64-ms-026 systemd[1]: Failed to start NetworkManager-wait-online.service - Network Manager Wait Online.
[aerickson@t-linux64-ms-026 ~]$ 

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Recreated from #1097 to run Windows CI from the main repo branch.

[aerickson]

Has been canarying on ms018 and ms019 for a few weeks. Ready for review.

[aerickson]

18.04 might have this issue as well, working on this some more.