sctp server and peerfsm thread is not down  #141

Hi,
I have two issues when i stop or destroy server.stackimpl:

1. sctp server in local peer is not down because it has not remote connection. ( in function destroy of class netty.NetworkGuard server check isconnected after destroy.)
2. in some shutdown situation , when peer call disconnect but peer's state is down(waiting connect timeout ) , peer did not dispatch stop event thus peer fsm thread still running and still reopen connection.
   Thank.