VRRP: add a sample capture and two test cases

The sample capture consists of VRRPv2/IPv4, VRRPv3/IPv4 and VRRPv3/IPv6
packets. It was produced using 7 MikroTik devices running RouterOS 6.10
and configured for the same set of virtual addresses with different
priorities per device. The devices were powered on one after another
with a ~30 seconds delay in the order of VRRP priority ascending. The
test cases decode the capture with and without "-v".
Add support for VRRPv3 (IPv4 only).
VRRP: top off the previous change

Update the test cases and squelch a compiler warning.
NDOize IP mobile, MSDP and NULL decoders
print-telnet: variable 'length' is updated and the new value is never used
print-ppp: variable 'length' is updated and the new value is never used
Merge pull request #372 from fxlb/print-telnet

print-telnet: variable 'length' is updated, the new value is never used
Merge pull request #373 from fxlb/print-ppp

print-ppp: variable 'length' is updated and the new value is never used
print-llc: some variables are updated and their new values are never used
NDOize 5 more decoders

Update Apple's IP over IEEE1394, Bluetooth, CALM/FAST, IPv6 fragments
and LAN emulation decoders. Remove some stray passages while at it.
NDOize AHCP, OTV and VXLAN decoders
NDOize ARCNET, BFD and GRE decoders
Merge pull request #375 from fxlb/print-llc

print-llc: some variables are updated, their new values are never used
Fix compilation with old versions of MSVC.

Some old versions of MSVC have broken C preprocessors and failed to
handle #ifdef/#else/#endif in the middle of a macro call.  Just
RRCP: don't include unneeded headers
VJC: NDOize
refine some past NDO conversions

Don't include unneeded headers and replace a few remaining printf's.
NDOize more small decoders

This change converts decoders for: DLT_RAW, IPv6 routing header, USB,
Symantec firewall and cHDLC.
NDOize print-ascii.c further

Introduce netdissect_options into hex_and_ascii_print_with_offset(),
hex_and_ascii_print() and related functions.
NDOize 8 more small decoders

This change converts ZeroMQ, IPX, MPLS, IPv6 options, PPPoE, RIPng,
PFLOG and Sun RPC decoders.