Commits on Nov 9, 2021

1. xds: prefer fed state gateway definitions if they're fresher (#11522) …

   Fixes an issue described in #10132, where if two DCs are WAN federated
   over mesh gateways, and the gateway in the non-primary DC is terminated
   and receives a new IP address (as is commonly the case when running them
   on ephemeral compute instances) the primary DC is unable to re-establish
   its connection until the agent running on its own gateway is restarted.
   
   This was happening because we always preferred gateways discovered by
   the `Internal.ServiceDump` RPC (which would fail because there's no way
   to dial the remote DC) over those discovered in the federation state,
   which is replicated as long as the primary DC's gateway is reachable.

   

   boxofrad committed Nov 9, 2021
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