sys: Remove $FreeBSD$: two-line .h pattern

Remove /^\s*\*\n \*\s+\$FreeBSD\$$\n/

infiniband: Convert BPF handling for IfAPI

Summary:
All callers of infiniband_bpf_mtap() call it through the wrapper macro,
which checks the if_bpf member explicitly. Since this is getting
hidden, move this check into the internal function and remove the
wrapper macro.

Reviewed by: hselasky
Sponsored by: Juniper Networks, Inc.
Differential Revision: https://reviews.freebsd.org/D39024

Factor out generic IP over infiniband, IPoIB, definitions and code
into net/if_infiniband.c and net/infiniband.h . No functional change
intended.

Differential Revision: https://reviews.freebsd.org/D26254
Reviewed by: melifaro@
MFC after: 1 week
Sponsored by: Mellanox Technologies // NVIDIA Networking