MFC r249664

Expose CAM_BOOT_DELAY as a kernel conf item now.

This allows users who boot without loader to adjust their environments
around slightly buggy or slow hardware.
MFC r249815

Return a lun count of 1 and a lun id of 0 when CAM attempts a REPORT_LUNS
command on a disk device.  This quieseces some noise on the console that
recently appeared.
MFC r249070

Update man page for igb(4) with a little bit of information about
hw.igb.num_queues for those so inclined.