These devices have never actually existed; the corresponding support
strings have been removed from the stock firmwares as well.

It seems the device was lost during the OpenWrt -> LEDE migration.

This reverts commit fcce9e52.

The x86-generic kernel does not fit into 4MB.

Backport another sysupgrade patch.

Fixes #1130

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

The staged sysupgrade allows to properly unmount the rootfs before writing
the new partitions. This will fix upgrades losing configuration when
parition sizes change on x86 and similar image types.

This will allow upgrading using the broken sysupgrade scripts in OpenWrt
CC without losing the configuration.

Fixes #1010

Fixes #1126

Reverts d5829d87 ("gluon-mesh-batman-adv-core: disable bridge port
learning on bat0").

Fixes #1121

Don't stop after the first error, as later error messages may make the
cause of the error much clearer in some cases.

The Airgateway LR is the same device as the normal Airgateway but with an detachable antenna. The Pro version is a cheap dual band device.

gluon-core: dns-cache documentation polish
Now its clear that upstreams severs normally means "community gateways".
* added cacheentries to description
* made upstream server description more general
* description of the A and AAAA-records for next_node added
* mention of Cache not being allocated when not set in site.conf 
* dns-cache doku polish

LEDE recently disabled multicast snooping by default:

https://git.lede-project.org/?p=project/netifd.git;a=commitdiff;h=52541140f8138e31958cdc3d7e42a4029fa6bbc9



Reenable it for Gluon as there have been no confirmed issues for
LEDE and no negative reports concerning Gluon v2016.2.x so far.

Closes #1025.

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

LEDE recently disabled multicast snooping by default:

https://git.lede-project.org/?p=project/netifd.git;a=commitdiff;h=52541140f8138e31958cdc3d7e42a4029fa6bbc9



Reenable it for Gluon as there have been no confirmed issues for
LEDE and no negative reports concerning Gluon v2016.2.x so far.

Closes #1025.

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