[Cherrypick] Match libwebrtc protocol priority #680
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Today, all relay candidates from Pion have the same priority. This PR attempts to reproduce libwebrtc's behavior, where the TURN servers candidates priority is based on the underlying relay protocol. UDP are preferred over TCP, which are preferred over the TLS options.
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Cherrypick from master (since we will keep using v2 for some time)
Description
Match libwebrtc's TURN protocol priority (TCP vs UDP vs TLS)
Reference issue
Fixes reproducibility issues as seen in the field