Support for setting proxies in http requests

[arthurzenika]

I am using netapp-ocum python binding to access netapp via a proxy, it would be nice to be able to configure this when creating the client.

The impacted code would be in https://github.com/powerhome/python-netapp-ocum/blob/master/netapp_ocum/http.py#L17-L24

Here is the documentation for use of proxies in python-requests https://docs.python-requests.org/en/latest/user/advanced/?highlight=proxies#proxies In my specific case I use a socks5 proxy as instructed in https://docs.python-requests.org/en/latest/user/advanced/?highlight=proxies#socks

(My current workaround is to monkeypatch NetApp_OCUM_HTTP._GET_worker = patched_GET_worker but I'd like to avoid that).