The Hornet UB is sold at least in the varieties. Without case it is a Hornet UB, with case and without connected USB port it is called AP121. If the USB port is present this device is called AP121U.
We have a AP121U in our mesh http://meshviewer.chemnitz.freifunk.net/#!v:m;n:00c0ca6efffa

This CPE is supported by OpenWRT and already running in Chemnitz

Tests done to verify that this worked as intended:
 * checked plattform_info image_name
 * checked primary_mac
 * does appear in ffmap-d3
 * does mesh
 * does fastd-VPN

Also remove the BROKEN check as the UniFi Outdoor Plus support seems to
work fine now.

Fixes #272

Signed-off-by: Felix Kaechele <felix@kaechele.ca>

Also
* create list of newly supported devices since v2015.1.2 in the v2015.2 release notes
* update information on docs/user/x86
* fix a comment in targets/ar71xx-generic/profiles.mk

These devices are identical to the TL-WR941 v4 & v5, so we don't need to
test them explicitly.

As the Gluon kernel won't be compatible with the OpenWrt upstream anymore,
we don't need the vermagic hack anymore.

Use the same image for sysupgrade on WZR-HP-AG300H and WZR-600DHP, but use
different factory images.

This reverts commit 8ad3c881.

We can't use the same image for these two devices, so as a workaround,
remove ZR-600DHP from the name for now, so the autoupdater can work and
users aren't confused.

This also takes us past the OpenWrt 15.05 final release.

Config for rootfs and grub is not needed anymore (https://dev.openwrt.org/ticket/18074)

Config file not needed anymore (set implicitly by gluon now)

Avoid empty vars

This reverts commit 6da1677d.

This broke due to a recent OpenWrt update.

Tested-by: @kokel

While the images are the same that are used for the Bullet M, adding these
copies will help users choose the correct image for their device.

These are identical to the TL-WR941ND (and identify as TL-WR941ND
internally).