Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

Merge tcpdump-4.1.1.

Merge tcpdump 4.0.0 from the vendor branch.

Merge of tcpdump 3.8.3 from tcpdump.org, with the following caveats:

print-atm.c no longer performs special handling for FORE headers; these
can no doubt be re-added at a later date.

print-fr.c is effectively a no-op.

print-llc.c has had the default_print_unaligned() call removed as
tcpdump no longer defines this function, however the prototype is still
present. Suggest we roll in a diff to use print_unknown_data().

Merge tcpdump 3.7.1

MFC after: 2 weeks

Add source routing support.

World, I'd like you to meet the first FreeBSD token Ring driver.
This is for various Olicom cards. An IBM driver is following.
This patch also adds support to tcpdump to decode packets on tokenring.
Congratulations to the proud father.. (below)

Submitted by: Larry Lile <lile@stdio.com>