3667 Allow ixgbe to use unsupported SFP modules
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Reviewed by: Richard Lowe <richlowe@richlowe.net>
Approved by: Dan McDonald <danmcd@nexenta.com>
	[illumos-gate merge]

commit 43fab1a9f38ff02e665a874ea0a8eb3818e61ff3
    3667 Allow ixgbe to use unsupported SFP modules