Suspend the GNS3 VM

Fix #656

gns3server/controller/gns3vm/vmware_gns3_vm.py

@@ -126,6 +126,21 @@ class VMwareGNS3VM(BaseGNS3VM):
         log.info("GNS3 VM IP address set to {}".format(guest_ip_address))
         self.running = True
 
+    @asyncio.coroutine
+    def suspend(self):
+        """
+        Suspend the GNS3 VM.
+        """
+
+        if self._vmx_path is None:
+            raise GNS3VMError("No VMX path configured, can't suspend the VM")
+        try:
+            yield from self._execute("suspend", [self._vmx_path])
+        except GNS3VMError as e:
+            log.warning("Error when suspending the VM: {}".format(str(e)))
+        log.info("GNS3 VM has been suspended")
+        self.running = False
+
     @asyncio.coroutine
     def stop(self):
         """