[easy] more flowLsp refactoring
[easy] more flowLsp refactoring

Summary: helpers to get and update the lsp env

Reviewed By: vrama628

Differential Revision: D25825595

fbshipit-source-id: 6304590304ed87108e713ae8eb50e79d4dbc3f23

nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow,nmote/flow