[VOL-2694] Use package specific logger instance in all log statements

Change-Id: Id216765f347be95872b820b63133daef7d2a7bbb
diff --git a/cmd/ofagent/common.go b/cmd/ofagent/common.go
new file mode 100644
index 0000000..7372b14
--- /dev/null
+++ b/cmd/ofagent/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 main Common Logger initialization
+package main
+
+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": "main"})
+	if err != nil {
+		panic(err)
+	}
+}
diff --git a/cmd/ofagent/main.go b/cmd/ofagent/main.go
index 2949eaa..911c0b2 100644
--- a/cmd/ofagent/main.go
+++ b/cmd/ofagent/main.go
@@ -44,13 +44,6 @@
 	fmt.Println(version.VersionInfo.String("  "))
 }
 
-func init() {
-	_, err := log.AddPackage(log.JSON, log.DebugLevel, nil)
-	if err != nil {
-		log.Errorw("unable-to-register-package-to-the-log-map", log.Fields{"error": err})
-	}
-}
-
 func setLogConfig(ctx context.Context, kvStoreHost, kvStoreType string, kvStorePort, kvStoreTimeout int) (kvstore.Client, error) {
 	client, err := kvstore.NewEtcdClient(kvStoreHost+":"+strconv.Itoa(kvStorePort), kvStoreTimeout)
 	if err != nil {
@@ -68,7 +61,7 @@
 	if kvClient != nil {
 		// Release all reservations
 		if err := kvClient.ReleaseAllReservations(ctx); err != nil {
-			log.Infow("fail-to-release-all-reservations", log.Fields{"error": err})
+			logger.Infow("fail-to-release-all-reservations", log.Fields{"error": err})
 		}
 		// Close the DB connection
 		kvClient.Close()
@@ -94,7 +87,7 @@
 
 	logLevel, err := log.StringToLogLevel(config.LogLevel)
 	if err != nil {
-		log.Fatalf("Cannot setup logging, %s", err)
+		logger.Fatalf("Cannot setup logging, %s", err)
 	}
 
 	// Setup default logger - applies for packages that do not have specific logger set
@@ -112,7 +105,7 @@
 	defer func() {
 		err := log.CleanUp()
 		if err != nil {
-			log.Errorw("unable-to-flush-any-buffered-log-entries", log.Fields{"error": err})
+			logger.Errorw("unable-to-flush-any-buffered-log-entries", log.Fields{"error": err})
 		}
 	}()
 
@@ -132,7 +125,7 @@
 
 	client, err := setLogConfig(ctx, config.KVStoreHost, config.KVStoreType, config.KVStorePort, config.KVStoreTimeout)
 	if err != nil {
-		log.Warnw("unable-to-create-kvstore-client", log.Fields{"error": err})
+		logger.Warnw("unable-to-create-kvstore-client", log.Fields{"error": err})
 	}
 
 	ofa, err := ofagent.NewOFAgent(&ofagent.OFAgent{
@@ -143,7 +136,7 @@
 		ConnectionRetryDelay:      config.ConnectionRetryDelay,
 	})
 	if err != nil {
-		log.Fatalw("failed-to-create-ofagent",
+		logger.Fatalw("failed-to-create-ofagent",
 			log.Fields{
 				"error": err})
 	}