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The primary rendezvous server is used for the initial rendezvous,
whether using WebRTC or not (Legacy Mode). This change provides the
location for a secondary rendezvous server to use for the WebRTC
negotiation. This is only done if the Companion indicates that it
supports this feature (sets “r2” to true in the JSON object it
posts). Any information provided by the Companion can be used by the
primary rendezvous server to determine which secondary server to use.

Change-Id: I8706c4f0fe66a0e902595689896003feff9cdff7