4416 Silence igb(7D) debug messages by default
Reviewed by: Toomas Soome <tsoome@me.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

PSARC 2007/624 Intel 82575 1Gb PCI Express NIC Driver
6591981 A new driver is needed to support Intel Zoar gigabit NIC