Suspend the GNS3 VM

Fix #656

gns3server/controller/gns3vm/base_gns3_vm.py

@@ -28,7 +28,6 @@ class BaseGNS3VM:
 
         self._controller = controller
         self._vmname = None
-        self._auto_stop = False
         self._ip_address = None
         self._port = 3080
         self._headless = False
@@ -245,26 +244,6 @@ class BaseGNS3VM:
 
         self._ram = new_ram
 
-    @property
-    def auto_stop(self):
-        """
-        Returns whether the VM should automatically be stopped when GNS3 quit
-
-        :returns: boolean
-        """
-
-        return self._auto_start
-
-    @auto_stop.setter
-    def auto_stop(self, new_auto_stop):
-        """
-        Set whether the VM should automatically be stopped when GNS3 quit
-
-        :param new_auto_stop: boolean
-        """
-
-        self._auto_stop = new_auto_stop
-
     @property
     def engine(self):
         """
@@ -291,6 +270,14 @@ class BaseGNS3VM:
 
         raise NotImplementedError
 
+    @asyncio.coroutine
+    def suspend(self):
+        """
+        Suspend the GNS3 VM.
+        """
+
+        raise NotImplementedError
+
     @asyncio.coroutine
     def stop(self, force=False):
         """