Just like we enabled multicast snooping on the batman-adv client bridge
again, let's do the same for the WAN side.

With one exception: The IGMP/MLD querier is kept disabled to avoid
becoming too "bossy"/"noisy" on a foreign network. The main router on
the WAN side should perform querying and by that enable
IGMP/MLD/snooping if it considers this appropriate there.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

A few issues with the bridge snooping were identified and fixed
upstream in OpenWRT:

* "firewall: Allow IGMP and MLD input on WAN" (r45613)
* "kernel: bridge: backport two snooping related patches" (r45783)
* netifd: "bridge: Fix multicast_to_unicast feature by hairpin+isolate"
  (OW: "netifd: update to the latest version, adds multicast-to-unicast fixes" (r46719))
* "kernel: bridge, multicast-to-unicast: assign src after pskb_may_pull()" (r46721)
* "kernel: bridge, multicast-to-unicast: fix echoes on STA" (46765)

These have very likely caused issues with the bridge snooping before,
which led to disabling it in the past. Let's reenable the multicast
snooping now that they were fixed for reduced multicast overhead on the
wifi.

Advantages are the following:

This mildly reduces overhead on the mesh layer. And significantly reduces
overhead on the AP interface and therefore significantly increases
available airtime (the currently most significant scalability bottleneck).

Secondly removes an easy, often accidental node-local Denial-of-Service
vector based on multicast flooding / streaming.

Thirdly, makes node-local multicast streaming feasible.

Finally should noticably increase battery life of mobile devices.

Note: bridge querier is disabled for br-wan. We want to avoid becoming
too "bossy"/"noisy" on a foreign network.

Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>

The main advantage is that procd is capable of logging stderr to logd,
making errors easier to debug.

Fixes #328

Add Buffalo WZR-HP-G300NH2 to Makefile, device is already supported in OpenWrt and LEDE.
Verified functionality with actual device.

Fixes #658

Filter IGMP+MLD

Caused by a broken backport.

Fixes #689

Use the common term; the "Expert Mode" never was a distinct mode of
operation anyways.

Fixes autoupdater for Hotnet-UB and AP121. Also add note about broken
autoupdates on Tube2H.

The arguments are now provided by gluon-mesh-batman-adv-core, so
gluon-radvd can be used with other mesh protocols.

[Matthias Schiffer: removed PROVIDES dependency]

gluon-neighbour-info: improve verbosity on wrong cli parameters

Some drivers (mt76) don't support arbitrary MAC addresses. Use the
addresses provided by the driver (avoiding the primary address) by default,
but fall back to our has-based scheme when the driver doesn't provide
(enough) addresses.

Also switch to kmod-ath10k-ct, so we can drop our AP+IBSS patch.

Accidentially forgot to commit this. The sleep is necessary so netifd can
actually stop the WLAN interfaces after `wifi down`.

[Matthias Schiffer:
  - improve commit message
  - add pidof check
  - also call `wifi down`
]

Fixes #823

gluon-luci-wifi-config: fix to work with legacy configs using macaddr instead of path to identify radios