Ensure that disconnects propagate through port-forwarded tunnel #3801
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When a client terminates, it should propagate over to the server on
remote host without it attempting to write. The defered cleanup wasn't
closing all the right connections to make this happen.
When a server terminates, re-execed teleport might not notice until
client sends new data. Re-execed teleport should exit on first observed
error in either direction and not wait for both ends.
Fixes #3749