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David Johnson authored
systemd-networkd and friends have become very chatty. This commit is about turning down the noise. It also removes PreferredLiftime=forever because it is no longer valid where it used to be, and cannot be used apparently in the DHCP case. Seems that the default is now "forever" anyway, so it's now irrelevant to us. (Older systemd-networkds would set the address lifetime to the advertised lease.) We also only mark an iface with CriticalConnection=yes once that iface has been chosen as the control net. We used to just mark them all in the udev helper so that we didn't have to modify the generated config after successful detection, but now systemd-networkd complains about bringing down a searched-but-not-control-net interface if it is critical. So, avoid that. Finally, I added `-q` to our invocation of systemd-networkd-wait-online, and increased the timeout with which we call it. Timeout increase is because we would get spurious event loop disconnect messages without it; and q to quiet it in other ways. Ugh.
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