MFC: r267638
MFC: r267638

Don't denounce peripherals on system shutdown. Together with r267321
(MFCed to stable/10 in r267775), we're now back to the pre-r228483
level of default verbosity. This in turn again typically allows for
reading information that userland might have printed on the screen
before initiating a halt, but still permits to debug potential device
shutdown problems on system shutdown via CAM_DEBUG etc.

Reviewed by:	mav
Sponsored by:	Bally Wulff Games & Entertainment GmbH

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