Run popeye on kube behind a http proxy

[lineberty-internal]

My cluster isn't accessible directly but through a proxy (tinyproxy) and I run all kubectl command like this:
HTTP_PROXY=host:port kubectl get pods

Is your feature request related to a problem? Please describe.
Without a proxy configuration, popeye can't connect to the cluster and I get a connection timeout.

Describe the solution you'd like
I'd like to run popeye through my proxy too so I'd want to define the proxy address with a cmd parameter and if possible with docker