Speak to Spacewalk XML-RPC API with Rust.
$ cargo run -- -U https://<spacewalk_addr:port>/ -m auth.login -j '["admin", "admin"]'
Result: String("<authkey>")
$ cargo run -- -U https://<spacewalk_addr:port>/ -m channel.listAllChannels -j '["<authkey>"]'
$ cargo run -- -U https://<spacewalk_addr:port>/ -m channel.software.listAllPackages -j '["<authkey>", "channel_label"]'