Fix qos_net's CLI to build correctly without default features #504
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Summary & Motivation (Problem vs. Solution)
Discovered by @cr-tk in #502
This change introduces a no-op qos_net CLI when the default "proxy" feature isn't enabled. The CLI simply panics because there is nothing to do: the CLI is the way to start the proxy, and does not make sense without the proxy feature.
How I Tested These Changes
On this branch,
cargo build --locked --no-default-features --release
succeeds.