Summary:
When using `flipperClient.stop()`, after `flipperClient.start()`, it's impossible to `start` new connection, since the previous instance would keep active `reconnect`, so would override the previous connection.
## Changelog
- clean reconnect timer when calling `flipperClient.stop()`
Pull Request resolved: https://github.com/facebook/flipper/pull/3646
Test Plan:
1. `flipperClient.start('Demo app', { urlBase: 'null:8333' });` - this will fail connection, but keep retrying
2. `flipperClient.stop()` - should disconnect from WS and clear all reconnect timers
3. `flipperClient.start('Demo app', { urlBase: 'localhost:8333' });` - should connect succefully
Reviewed By: antonk52
Differential Revision: D35810547
Pulled By: lblasa
fbshipit-source-id: 6f0b04df890c1519abb72895157785b01d35b5f2
d93ce00736