Enforce IPv6 in sandcastle
Enforce IPv6 in sandcastle

Summary: Prefer IPv6 through JAVA_TOOL_OPTIONS and uppercase the env variables.

Reviewed By: IanChilds

Differential Revision: D5190470

fbshipit-source-id: ccad35ddc4fba544830d139bef73631db84151f8

facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho,facebook/litho