[BUG] Spurious test failure in networking integration test

[BUG] Spurious test failure in networking integration test

[Alyssa Ross]

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I'm seeing a test failure sometimes that looks like this:

	unexpected connection data: qemu-system-aarch64: terminating on signal 15 from pid 184 ()

I think this is because, now that the nc command in the networking
integration test has a timeout, it's possible for it to time out after
having opened the connection, but before having written all its input to
it.  I think the test should therefore ignore connections that send a
prefix of the expected data (including nothing), and just wait for the
next connection rather than failing if that happens.

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