rustfmt.toml: group_imports = StdExternalCrate
rustfmt.toml: group_imports = StdExternalCrate

Reviewed By: zertosh

Differential Revision: D38485268

fbshipit-source-id: 2a193d675b60f67860fc437b0e2ee4982af8706f

facebook/relay,xuorig/relay,facebook/relay,xuorig/relay,facebook/relay,xuorig/relay,xuorig/relay,xuorig/relay,facebook/relay,facebook/relay,xuorig/relay,facebook/relay