Zigbee firmware updates

[rlithgow1]

@YapFlapper @g.shepperd This was listed on 2.2.7's release... See here

2.2.7 Zigbee OTA updates

Zigbee OTA updates are now available for specific drivers/devices, OTA updates are executed from the driver page by clicking the updateFirmware command, status is output to live logs. We have firmware files for the following manufacturers: Sengled, Philips Hue and Osram/Sylvania Drivers that include the new updateFirmware command are all of the Generic Zigbee bulb drivers, the generic Zigbee outlet driver, the Hue specific device drivers (motion and button controllers) and two of the Sengled …