[1] All logs should contain a reference to the channel so that it is easy to search for logs about a specific channel.
[2] EPP ssl handshake failure should be logged at warning. It is mostly the client that failed to complete the handshake, for example by sending bad cert, or not sending cert, or not using the correct SSL version. We should not lot it at error and spam the log.
[3] When the EPP response is not 200, we should not log at error because it means that the GAE app responded successfully. For example when datastore contention occurs, app engine responds with a non-200 status and logs at warning. The proxy should not at a higher level than app engine itself.
[4] Timeout is a non-fatal error that should be logged at warning.
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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=207562299
6810e959f9