handle lifecyclestop() when connecting

[changyujiang]

Hope to handle lifecyclestop() in Connecting state.

[changyujiang]

Sscenario:
In demo app, I pointed echoService to an invalid address, scarlet keep trying to reconnect.

Issue:
When I logged out during WaitingToTry, websocket is closed and stopped retry. While I logged out during Connecting, the log_out event is not handled and websocket connection keeps failing and retrying.

We might need to handle lifecycleStop during Connecting state, or a more graceful way to solve it.

[ilyaklyukin]

Similar issue on 0.2.x branch, but there is no connection.kt class...