[VOL-1614] Device Management update in the Core

This commit went over the device management of devices in the Core
and made the following changes:
1) Update the device state machine to not remove logical
device or ports when a device is disabled.
2) Fix some issues around device deletion
3) Add additional APIs between the Core and Adapters to handle
the scenarios of enable/disable/delete a device
4) Update the simulated Adapters to handle disable/reenable/delete
5) Add a new set of tests for teh device state machine.

Change-Id: Ib2be87ec011762d5315a6d54581a87c1891e92be
diff --git a/adapters/common/core_proxy.go b/adapters/common/core_proxy.go
index 5bbd176..e1a7e34 100644
--- a/adapters/common/core_proxy.go
+++ b/adapters/common/core_proxy.go
@@ -178,6 +178,27 @@
 	return unPackResponse(rpc, deviceId, success, result)
 }
 
+func (ap *CoreProxy) DeleteAllPorts(ctx context.Context, deviceId string) error {
+	log.Debugw("DeleteAllPorts", log.Fields{"deviceId": deviceId})
+	rpc := "DeleteAllPorts"
+	// Use a device specific topic to send the request.  The adapter handling the device creates a device
+	// specific topic
+	toTopic := ap.getCoreTopic(deviceId)
+	args := make([]*kafka.KVArg, 2)
+	id := &voltha.ID{Id: deviceId}
+
+	args[0] = &kafka.KVArg{
+		Key:   "device_id",
+		Value: id,
+	}
+
+	// Use a device specific topic as we are the only adaptercore handling requests for this device
+	replyToTopic := ap.getAdapterTopic()
+	success, result := ap.kafkaICProxy.InvokeRPC(nil, rpc, &toTopic, &replyToTopic, true, deviceId, args...)
+	log.Debugw("DeleteAllPorts-response", log.Fields{"deviceId": deviceId, "success": success})
+	return unPackResponse(rpc, deviceId, success, result)
+}
+
 func (ap *CoreProxy) DeviceStateUpdate(ctx context.Context, deviceId string,
 	connStatus voltha.ConnectStatus_ConnectStatus, operStatus voltha.OperStatus_OperStatus) error {
 	log.Debugw("DeviceStateUpdate", log.Fields{"deviceId": deviceId})
@@ -211,7 +232,7 @@
 
 func (ap *CoreProxy) ChildDeviceDetected(ctx context.Context, parentDeviceId string, parentPortNo int,
 	childDeviceType string, channelId int, vendorId string, serialNumber string, onuId int64) error {
-	log.Debugw("ChildDeviceDetected", log.Fields{"pPeviceId": parentDeviceId, "channelId": channelId})
+	log.Debugw("ChildDeviceDetected", log.Fields{"pDeviceId": parentDeviceId, "channelId": channelId})
 	rpc := "ChildDeviceDetected"
 	// Use a device specific topic to send the request.  The adapter handling the device creates a device
 	// specific topic
@@ -261,6 +282,46 @@
 
 }
 
+func (ap *CoreProxy) ChildDevicesLost(ctx context.Context, parentDeviceId string) error {
+	log.Debugw("ChildDevicesLost", log.Fields{"pDeviceId": parentDeviceId})
+	rpc := "ChildDevicesLost"
+	// Use a device specific topic to send the request.  The adapter handling the device creates a device
+	// specific topic
+	toTopic := ap.getCoreTopic(parentDeviceId)
+	replyToTopic := ap.getAdapterTopic()
+
+	args := make([]*kafka.KVArg, 1)
+	id := &voltha.ID{Id: parentDeviceId}
+	args[0] = &kafka.KVArg{
+		Key:   "parent_device_id",
+		Value: id,
+	}
+
+	success, result := ap.kafkaICProxy.InvokeRPC(nil, rpc, &toTopic, &replyToTopic, true, parentDeviceId, args...)
+	log.Debugw("ChildDevicesLost-response", log.Fields{"pDeviceId": parentDeviceId, "success": success})
+	return unPackResponse(rpc, parentDeviceId, success, result)
+}
+
+func (ap *CoreProxy) ChildDevicesDetected(ctx context.Context, parentDeviceId string) error {
+	log.Debugw("ChildDevicesDetected", log.Fields{"pDeviceId": parentDeviceId})
+	rpc := "ChildDevicesDetected"
+	// Use a device specific topic to send the request.  The adapter handling the device creates a device
+	// specific topic
+	toTopic := ap.getCoreTopic(parentDeviceId)
+	replyToTopic := ap.getAdapterTopic()
+
+	args := make([]*kafka.KVArg, 1)
+	id := &voltha.ID{Id: parentDeviceId}
+	args[0] = &kafka.KVArg{
+		Key:   "parent_device_id",
+		Value: id,
+	}
+
+	success, result := ap.kafkaICProxy.InvokeRPC(nil, rpc, &toTopic, &replyToTopic, true, parentDeviceId, args...)
+	log.Debugw("ChildDevicesDetected-response", log.Fields{"pDeviceId": parentDeviceId, "success": success})
+	return unPackResponse(rpc, parentDeviceId, success, result)
+}
+
 func (ap *CoreProxy) GetDevice(ctx context.Context, parentDeviceId string, deviceId string) (*voltha.Device, error) {
 	log.Debugw("GetDevice", log.Fields{"deviceId": deviceId})
 	rpc := "GetDevice"