Add support for proxy maven deployment
Add support for proxy maven deployment

Summary: This is helpful when uploading snapshots from a devserver.

Reviewed By: priteshrnandgaonkar

Differential Revision: D10008434

fbshipit-source-id: de00acee189e751982f622c0ac317e9c2ea14540

facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper,facebook/flipper