[VOL-3731] Delete etcd stale data after olt reboot

Change-Id: I345b1af33de943c795888ad2defe2e470b6ea2c4
diff --git a/rw_core/core/device/state/transitions.go b/rw_core/core/device/state/transitions.go
index 80ac28e..2f926a4 100644
--- a/rw_core/core/device/state/transitions.go
+++ b/rw_core/core/device/state/transitions.go
@@ -101,6 +101,7 @@
 	RunPostDeviceDelete(ctx context.Context, curr *voltha.Device) error
 	ChildDeviceLost(ctx context.Context, curr *voltha.Device) error
 	DeleteAllLogicalPorts(ctx context.Context, curr *voltha.Device) error
+	DeleteAllLogicalMeters(ctx context.Context, curr *voltha.Device) error
 	DeleteAllDeviceFlows(ctx context.Context, curr *voltha.Device) error
 	ReconcilingCleanup(ctx context.Context, curr *voltha.Device) error
 }
@@ -158,13 +159,13 @@
 			deviceType:    parent,
 			previousState: deviceState{Admin: voltha.AdminState_UNKNOWN, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN, Transient: core.DeviceTransientState_ANY},
 			currentState:  deviceState{Admin: voltha.AdminState_UNKNOWN, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN, Transient: core.DeviceTransientState_FORCE_DELETING},
-			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.RunPostDeviceDelete}})
+			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllLogicalMeters, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.RunPostDeviceDelete}})
 	transitionMap.transitions = append(transitionMap.transitions,
 		transition{ //DELETE device after adapter response
 			deviceType:    parent,
 			previousState: deviceState{Admin: voltha.AdminState_UNKNOWN, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN, Transient: core.DeviceTransientState_ANY},
 			currentState:  deviceState{Admin: voltha.AdminState_UNKNOWN, Connection: voltha.ConnectStatus_UNKNOWN, Operational: voltha.OperStatus_UNKNOWN, Transient: core.DeviceTransientState_DELETING_POST_ADAPTER_RESPONSE},
-			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.RunPostDeviceDelete}})
+			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllLogicalMeters, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.RunPostDeviceDelete}})
 	transitionMap.transitions = append(transitionMap.transitions,
 		transition{ //DELETE no operation transition
 			deviceType:    parent,
@@ -176,13 +177,13 @@
 			deviceType:    parent,
 			previousState: deviceState{Admin: voltha.AdminState_ENABLED, Connection: voltha.ConnectStatus_REACHABLE, Operational: voltha.OperStatus_ACTIVE, Transient: core.DeviceTransientState_NONE},
 			currentState:  deviceState{Admin: voltha.AdminState_ENABLED, Connection: voltha.ConnectStatus_UNREACHABLE, Operational: voltha.OperStatus_UNKNOWN, Transient: core.DeviceTransientState_NONE},
-			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.DeleteAllDeviceFlows}})
+			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllLogicalMeters, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.DeleteAllDeviceFlows}})
 	transitionMap.transitions = append(transitionMap.transitions,
 		transition{
 			deviceType:    parent,
 			previousState: deviceState{Admin: voltha.AdminState_DISABLED, Connection: voltha.ConnectStatus_REACHABLE, Operational: voltha.OperStatus_UNKNOWN, Transient: core.DeviceTransientState_NONE},
 			currentState:  deviceState{Admin: voltha.AdminState_DISABLED, Connection: voltha.ConnectStatus_UNREACHABLE, Operational: voltha.OperStatus_UNKNOWN, Transient: core.DeviceTransientState_NONE},
-			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.DeleteAllDeviceFlows}})
+			handlers:      []transitionHandler{dMgr.DeleteAllLogicalPorts, dMgr.DeleteAllLogicalMeters, dMgr.DeleteAllChildDevices, dMgr.DeleteLogicalDevice, dMgr.DeleteAllDeviceFlows}})
 	transitionMap.transitions = append(transitionMap.transitions,
 		transition{
 			deviceType:    parent,
diff --git a/rw_core/core/device/state/transitions_test.go b/rw_core/core/device/state/transitions_test.go
index 5065a60..68e8b4d 100644
--- a/rw_core/core/device/state/transitions_test.go
+++ b/rw_core/core/device/state/transitions_test.go
@@ -208,11 +208,12 @@
 	device = getDevice(true, voltha.AdminState_ENABLED, voltha.ConnectStatus_UNREACHABLE, voltha.OperStatus_UNKNOWN)
 	handlers = transitionMap.getTransitionHandler(ctx, device, previousDevice, core.DeviceTransientState_NONE,
 		core.DeviceTransientState_NONE)
-	assert.Equal(t, 4, len(handlers))
+	assert.Equal(t, 5, len(handlers))
 	assert.True(t, reflect.ValueOf(tdm.DeleteAllLogicalPorts).Pointer() == reflect.ValueOf(handlers[0]).Pointer())
-	assert.True(t, reflect.ValueOf(tdm.DeleteAllChildDevices).Pointer() == reflect.ValueOf(handlers[1]).Pointer())
-	assert.True(t, reflect.ValueOf(tdm.DeleteLogicalDevice).Pointer() == reflect.ValueOf(handlers[2]).Pointer())
-	assert.True(t, reflect.ValueOf(tdm.DeleteAllDeviceFlows).Pointer() == reflect.ValueOf(handlers[3]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteAllLogicalMeters).Pointer() == reflect.ValueOf(handlers[1]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteAllChildDevices).Pointer() == reflect.ValueOf(handlers[2]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteLogicalDevice).Pointer() == reflect.ValueOf(handlers[3]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteAllDeviceFlows).Pointer() == reflect.ValueOf(handlers[4]).Pointer())
 
 	previousDevice = getDevice(true, voltha.AdminState_ENABLED, voltha.ConnectStatus_UNREACHABLE, voltha.OperStatus_UNKNOWN)
 	device = getDevice(true, voltha.AdminState_ENABLED, voltha.ConnectStatus_REACHABLE, voltha.OperStatus_ACTIVE)
@@ -225,11 +226,12 @@
 	device = getDevice(true, voltha.AdminState_DISABLED, voltha.ConnectStatus_UNREACHABLE, voltha.OperStatus_UNKNOWN)
 	handlers = transitionMap.getTransitionHandler(ctx, device, previousDevice, core.DeviceTransientState_NONE,
 		core.DeviceTransientState_NONE)
-	assert.Equal(t, 4, len(handlers))
+	assert.Equal(t, 5, len(handlers))
 	assert.True(t, reflect.ValueOf(tdm.DeleteAllLogicalPorts).Pointer() == reflect.ValueOf(handlers[0]).Pointer())
-	assert.True(t, reflect.ValueOf(tdm.DeleteAllChildDevices).Pointer() == reflect.ValueOf(handlers[1]).Pointer())
-	assert.True(t, reflect.ValueOf(tdm.DeleteLogicalDevice).Pointer() == reflect.ValueOf(handlers[2]).Pointer())
-	assert.True(t, reflect.ValueOf(tdm.DeleteAllDeviceFlows).Pointer() == reflect.ValueOf(handlers[3]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteAllLogicalMeters).Pointer() == reflect.ValueOf(handlers[1]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteAllChildDevices).Pointer() == reflect.ValueOf(handlers[2]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteLogicalDevice).Pointer() == reflect.ValueOf(handlers[3]).Pointer())
+	assert.True(t, reflect.ValueOf(tdm.DeleteAllDeviceFlows).Pointer() == reflect.ValueOf(handlers[4]).Pointer())
 
 	previousDevice = getDevice(true, voltha.AdminState_DISABLED, voltha.ConnectStatus_UNREACHABLE, voltha.OperStatus_UNKNOWN)
 	device = getDevice(true, voltha.AdminState_DISABLED, voltha.ConnectStatus_REACHABLE, voltha.OperStatus_UNKNOWN)
@@ -330,6 +332,7 @@
 		},
 		expectedParentHandlers: []transitionHandler{
 			tdm.DeleteAllLogicalPorts,
+			tdm.DeleteAllLogicalMeters,
 			tdm.DeleteAllChildDevices,
 			tdm.DeleteLogicalDevice,
 			tdm.RunPostDeviceDelete,
@@ -348,7 +351,7 @@
 			t.Run(testName, func(t *testing.T) {
 				handlers = transitionMap.getTransitionHandler(ctx, device, previousDevice, core.DeviceTransientState_FORCE_DELETING,
 					core.DeviceTransientState_ANY)
-				assert.Equal(t, 4, len(handlers))
+				assert.Equal(t, 5, len(handlers))
 				for idx, expHandler := range deleteDeviceTest.expectedParentHandlers {
 					assert.True(t, reflect.ValueOf(expHandler).Pointer() == reflect.ValueOf(handlers[idx]).Pointer())
 				}