VOL-2146 Put Lock around flow mgr map. Preventing possible concurrent map write with concurrent onu indications.

Change-Id: I4a0a25fbf1a7e82d662753e8e2e25f8c88dbb8a1
diff --git a/adaptercore/device_handler.go b/adaptercore/device_handler.go
index a9bee44..3053f2a 100644
--- a/adaptercore/device_handler.go
+++ b/adaptercore/device_handler.go
@@ -901,7 +901,7 @@
 			"openolt", onuDevice.Type, onuDevice.Id, onuDevice.ProxyAddress.DeviceId, "")
 		if err != nil {
 			log.Errorw("Failed to send inter-adapter-message", log.Fields{"OnuInd": onuInd,
-				"From Adapter": "openolt", "DevieType": onuDevice.Type, "DeviceID": onuDevice.Id})
+				"From Adapter": "openolt", "DevieType": onuDevice.Type, "DeviceID": onuDevice.Id, "Error": err})
 			return
 		}
 	} else {