Summary:
@public
If you call NetInfo.getCurrentConnectivity multiple times in succession, we'll create a bunch of callbacks but lose them in the ether.
With this fix, we'll unschedule them before creating a new one, which should resolve some crashes we're seeing.
Reviewed By: PeteTheHeat
Differential Revision: D10409486
fbshipit-source-id: 6065b09fa626f7f06aed9bf0e278c0a6a6169f58