Do not connect on shutdown

- in some cases, such as when using trustedpeer, outgoingSynSender
  threads would wake up and try to connect. This fixes it.

src/class_outgoingSynSender.py

@@ -96,6 +96,8 @@ class outgoingSynSender(threading.Thread, StoppableThread):
                 shared.alreadyAttemptedConnectionsListLock.release()
             except threading.ThreadError as e:
                 pass
+            if shared.shutdown:
+                break
             self.name = "outgoingSynSender-" + peer.host.replace(":", ".") # log parser field separator
             if peer.host.find(':') == -1:
                 address_family = socket.AF_INET