Do not log warning at qemu exit on windows if it's normal

Fix #777

gns3server/compute/base_node.py

@@ -333,7 +333,17 @@ class BaseNode:
         """
         if not self._wrap_console:
             return
+        remaining_trial = 60
+        while True:
+            try:
                 (reader, writer) = yield from asyncio.open_connection(host="127.0.0.1", port=self._internal_console_port)
+                break
+            except (OSError, ConnectionRefusedError) as e:
+                print(self._internal_console_port)
+                if remaining_trial <= 0:
+                    raise e
+            yield from asyncio.sleep(0.1)
+            remaining_trial -= 1
         yield from AsyncioTelnetServer.write_client_intro(writer, echo=True)
         server = AsyncioTelnetServer(reader=reader, writer=writer, binary=True, echo=True)
         self._wrapper_telnet_server = yield from asyncio.start_server(server.run, self._manager.port_manager.console_host, self.console)

gns3server/compute/qemu/qemu_vm.py

@@ -922,7 +922,8 @@ class QemuVM(BaseNode):
             self.status = "stopped"
             self._hw_virtualization = False
             self._process = None
-            if returncode != 0:
+            # A return code of 1 seem fine on Windows
+            if returncode != 0 and (returncode != 1 or not sys.platform.startswith("win")):
                 self.project.emit("log.error", {"message": "QEMU process has stopped, return code: {}\n{}".format(returncode, self.read_stdout())})
 
     @asyncio.coroutine