VOL-2920 - Remove NBI passthrough functions.

Modified the NBIHandler to reference device, logical device, and adapter managers as embedded types, allowing the managers to directly implement API functions, without the need for individual passthrough functions.
Also created a new event.Manager type, which is embedded in device.LogicalManager.
Also renamed device.NewDeviceManagers() to device.NewManagers().

Change-Id: I8455da79b991ee67cc16cf898b00b0c98ea97bcd
diff --git a/rw_core/core/device/event/common.go b/rw_core/core/device/event/common.go
new file mode 100644
index 0000000..ebb1ad3
--- /dev/null
+++ b/rw_core/core/device/event/common.go
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Package core Common Logger initialization
+package event
+
+import (
+	"github.com/opencord/voltha-lib-go/v3/pkg/log"
+)
+
+var logger log.Logger
+
+func init() {
+	// Setup this package so that it's log level can be modified at run time
+	var err error
+	logger, err = log.AddPackage(log.JSON, log.ErrorLevel, log.Fields{"pkg": "queue"})
+	if err != nil {
+		panic(err)
+	}
+}