Add proxies property based on environment variables for HTTP requests #3
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In its current state, portainer-cli does not work behind a corporate proxy: all HTTP requests behind a proxy return a timeout.
In this feature I added a 'proxies' dictionnary which is set at startup and based on 'HTTP_PROXY' and 'HTTPS_PROXY' env variables, and then this 'proxies' dictionnary is passed to all requests.
If both HTTP_PROXY and HTTPS_PROXY are unset or empty, 'proxies' dict stays empty.