Devices should not be disconnected when an instance shuts down.

Change-Id: I0864c1f79b52e021c4ebbcd3a5bdb3eb7c3f1614

@@ -109,9 +109,6 @@ public class OpenFlowDeviceProvider extends AbstractProvider implements DevicePr
 
     @Deactivate
     public void deactivate() {
-        for (OpenFlowSwitch sw : controller.getSwitches()) {
-            providerService.deviceDisconnected(DeviceId.deviceId(uri(sw.getId())));
-        }
         providerRegistry.unregister(this);
         controller.removeListener(listener);
         providerService = null;

@@ -97,7 +97,6 @@ public class OpenFlowDeviceProviderTest {
     @After
     public void tearDown() {
         provider.deactivate();
-        assertTrue("devices should be removed", registry.connected.isEmpty());
         assertNull("listener should be removed", controller.listener);
         provider.controller = null;
         provider.providerRegistry = null;