Make plugin updates work
Make plugin updates work

Summary:
Effectively just removes and re-installs but that way we know
we have everything we need.

Reviewed By: jknoxville

Differential Revision: D18479831

fbshipit-source-id: 5d47abfc660288e1137f393534512997e8b3f83e

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