tcp_sink: don't hang on flush if reconnecting #92
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This fixes a bug where the TCP Sink would hang indefinitely on Flush()
if it was unable to reconnect.
It also adds the SinkOption interface for configuring the TCP Sink,
previously could only be done via environment variables (it still
defaults to using env vars). This changes the function signature of
NewTCPStatsdSink(), but the change should not be breaking since the new
"opts" argument is variadic.
This also significantly increases the code coverage of the TCP Sink
tests.