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imp
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V 27
2020-09-28T16:19:29.541564Z
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V 468
For mulitcons boot, report it and which console is primary

Until we can do proper /etc/rc output on both consoles in multicons
boot (or all of them if we ever generalize), report when we are
booting multicons. Also report the primary console. This will be a big
hint why output stops after this line (though some slow USB discovery
still happens after mountroot / init starts).

Reviewed by: scottl@, tsoome@
Differential Revision: https://reviews.freebsd.org/D26574

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