Fixes checksum failures on TT version updates.

Fixes #1321

The first one adds a fix that might potentially result in multicast packet
loss once we would enable multicast_mode again.

The second one avoids some small but unnecessary overhead. More
importantly though, it is supposed to ease further multicast improvements
later (e.g. no need for a multicast sending node to determine overlap
between WANT_ALL_IPV4/6 flags and TT entries while on fast-path).

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

3aaa772ef520 bmx7: bump version
ccd4210f0ba7 bmx7: add PKG_MIRROR_HASH
d6dcd0c75630 bmx6: add PKG_MIRROR_HASH
536782119f0a alfred: upgrade package to latest release 2018.0
6a6f5da5efd5 batctl: upgrade package to latest release 2018.0
3bb75b003563 batman-adv: upgrade package to latest release 2018.0
2f74073c209d bmx7: bump version to 58b3823262512a48f5174e6778b2368c55bd05d9
733e935f04fc cjdns: v20 -> v20.1
f0ee73aa2285 bmx7: bump version
21a6454d7226 bmx6: bump to latest upstream version

Improves performance slightly.

Fixes "hw csum failure" log spam in batman-adv.

Updates batman-adv and alfred to 2017.1. This also allows us to drop our
last batman-adv patch.

Also remove our own no_rebroadcast patch, as batman-adv v2016.5 now has a
more sophisticated rebroadcast suppression that should work automatically
in the most relevant cases.

Fixes a build issue when switching targets.

This lifts batman-adv and alfred to version 2016.4.

Introduce new fixes:

 * Avoid nullptr dereference in bla after vlan_insert_tag
 * Avoid nullptr dereference in dat after vlan_insert_tag
 * Avoid tt_req_node list put for unhashed entry
 * Fix orig_node_vlan leak on orig_node_release
 * Fix non-atomic bla_claim::backbone_gw access
 * Fix reference leak in batadv_find_router
 * Free last_bonding_candidate on release of orig_node

Also replace the gluon version of the speedyjoin patch with the one already
included in openwrt-routing.

Signed-off-by: Sven Eckelmann <sven.eckelmann@open-mesh.com>

Speedy join only works when the received packet is either broadcast or an
4addr unicast packet. Thus packets converted from broadcast to unicast via
the gateway handling code have to be converted to 4addr packets to allow
the receiving gateway server to add the sender address as temporary entry
to the translation table.

Not doing it will make the batman-adv gateway server drop the DHCP response
in many situations because it doesn't yet have the TT entry for the
destination of the DHCP response.

Signed-off-by: Sven Eckelmann <sven@narfation.org>

batman-adv & alfred 2016.2.

Should be redundant after 0bd0df6f

This also updates batman-adv & alfred to 2015.1

This should workaround batman-adv's inability to deal with different MTUs
which need fragmentation.

Fixes #435

This gets us an up-to-date alfred (and batman-adv 2014.x, as soon as we start to
support it).