Deflake TestBindOverlay in //test/e2e:integration_test

Test failure happens when `echo` writes late:
* Server nc shuts down write when it sees EOF from stdin.
* Client nc closes the connection when it detects EOF from socket and no data
  in internal write buffer.

Using `-q` flag to make server not shutting down write in the beginning, while
letting connection to be closed by client. As `-q` flag's default value varies
in different netcat versions, we always specify it to prevent future breakage.

PiperOrigin-RevId: 349504016

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