nats-io / nats-server / 4361

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main: 85%

Pull #1183

travis-ci

Backward compatibility with previous servers

Want to keep this commit separate so that we can easily remove
when we no longer want to support both prefixes.

- If this server receives a "$GR." message, it takes the subject
  and tries to process this locally. If there is no cluster race
  reply may be received ok (like before).
- If this server sends a routed reply, it detects if sending to
  an older server (then uses $GR.) or not (then uses $GNR)
- Gateway INFO has a new field that indicates if the server is
  using the new prefix.

Signed-off-by: Ivan Kozlovic <ivan@synadia.com>

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