Fixed up version of r294061 that was reverted due to breakage of features
(netmap) and architectures(i386). <I'll take the pointyhat on that one>

r283883

• update to 3.1.0

r283893

• update SRIOV API changes related to future possible MFC of SRIOV work

r285590

• Fix ixgbe(4) SRIOV VF initialization bugs

r285591

• Remove version check for FLOWID

r285592

• Update netmap support for ixgbe SRIOV VFs.

r286238

• Fixup MTU zeroing if INET/INET6 are undefined.

Submitted by: kevin bowling <kevin.bowling@kev009.com>
Differential Revision: https://reviews.freebsd.org/D4273