Announce IFCAP_LINKSTATE capability and let network stack know link state changes.  Hide superfluous link up/down message under bootverbose since if_link_state_change(9) shows that information. While I'm here, change baudrate with the resolved speed of the established link instead of blindly setting it 1G. Unfortunately, it seems there is no way to differentiate 10/100Mbps from non-gigabit link so just assume we established a 100Mbps link if current link is not a gigabit link.
Announce IFCAP_LINKSTATE capability and let network stack know link
state changes.  Hide superfluous link up/down message under
bootverbose since if_link_state_change(9) shows that information.
While I'm here, change baudrate with the resolved speed of the
established link instead of blindly setting it 1G. Unfortunately,
it seems there is no way to differentiate 10/100Mbps from
non-gigabit link so just assume we established a 100Mbps link if
current link is not a gigabit link.

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