Werk #8649: cmk-update-agent: Prevent using proxy for HTTP calls

On systems where curl is installed, the agent updater is using this command to communicate with it's update server.

By default curl is using proxies configured via environment variables http_proxy, https_proxy, etc.. Since the update server is usually an internal host which is directly reachable and not via proxy, we suppress the use of a proxy with the curl --noproxy option.

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