This makes the UVC camera_image() method not log into the camera on
every single image fetch, which reduces load on hass and the camera,
and lowers the latency to get an actual image fetched.
This adds support for Ubiquiti's UniFi Video cameras via their
NVR device (or service). By configuring just the address of the
NVR and a valid API key, all cameras are discovered and enabled,
including direct-to-camera image snapshot-based video support.
Dan Smith
Fabian Affolter