unifi: update to unifi-5.8.28

New features (omitting bugfixes) since ~5.5.28:

-Add BaseStationXG LED bar color control to the device properties panel.
-Local SSO login.
-Add app switcher.
-Add speed and duplex config for USG interfaces.
-Add WiFi Happiness to client STA statistics.
-Allow users to opt-out wireless uplinking/meshing on per-radio basis.
-Assign USG Physical Ports to Logical Networks.
-Add netconsole logging to site config.
-Allow setting Management VLAN at Access Points.
-Property Panel: Show images of most popular client devices.
-Added support for USC8 switch.
-Add WeChat authentication to Hotspot.
-Add Elite Device service.
-Allow setting opacity on Image-type maps.
-New Channel Distribution widget.
-Add Scheduled Upgrades support (Beta).
-Add site VPN route distance.
-Add app switcher.
-Allow users to opt-out wireless uplinking/meshing on per-radio basis.
-Support Antenna selection for internal antenna.
-Add Intrusion Prevention System (IPS) [beta].
-Link to property panel from Location on Neighboring Access Points page.
-Add IPv6 support (Beta).
-Add restart devices permission.
-Add support for new Elite Device service.
-Add Bulgarian translations to the Hotspot Portal.
-Batch remove vouchers.
-Customize voucher columns.
-Ability to display historical statistics per Client (traffic, packets, signal power etc.).
-Add support for SNMPv3.
-Add GeoIP Filtering options to settings [Beta].
-Add Virtual devices on Maps to plan coverage.
-Add SSH keys to authenticate to device.
-Add Auto Channel feature on Maps.
-Add Release Notes.
-Add ability to create and set user defined DHCP options.
-Add Wireless Uplink priority.
-Add support for new Elite Device service.
-Add RADIUS MAC Authentication.
-Add Firmware Manager to cache locally firmwares.
-Add AirView (SHD exclusive).
-Add Switch Port Profiles.
-Add USG Performance Graphs.
-Add AirTime for UAP-SHD [alpha].
-Add temperatures to USG-Pro properties window.
-Add Facebook Wi-Fi Authentication [Alpha].
-Add DPI blocking per categories [Alpha].
-Add Insights / Controller Logs page.
-Add LAN traffic statistics for client in Property Panel.
-Add Debug Dashboard to Statistics section (Beta).
-Batch add and remove device tags.
-Add Arabic language to Hotspot Portal.
-Add permissions options when inviting a site admin (device adoption, etc.).
-Allow configure 8 SSIDs per radio (on supported devices).
-Add Finnish and Hungarian to the languages supported by Hotspot Portal.
-Add LLDP MED configuration.
-Add Outdoor / Indoor Switch.
-Add NTP server fields.
-Add batch device provision.
-Add DB migration page and show upgrade progress.
-Add date header to email notifications.
-Install and run service as `unifi` user instead of as root on Debian/Ubuntu.
-Add Logging settings.
-Add batch edit switches.
-Add UPnP service (moved from config.properties).
-Add Multicast DNS Service (moved from config.properties).
-Add RADIUS-based authorization in Hotspot [BETA].
-Add new type of map with predictive coverage [BETA].
-Add Ubiquiti store (buy devices directly from the controller) [BETA].
-Add EDU SIP settings.
-Add Greek translations.

(tnn)