[VOL-3069]Pass Context down the execution call hierarchy across voltha codebase

Change-Id: I97a2630d9a4fe5dc3161113539edda476534f186
diff --git a/rw_core/mocks/device_manager.go b/rw_core/mocks/device_manager.go
index e83f935..194b18d 100644
--- a/rw_core/mocks/device_manager.go
+++ b/rw_core/mocks/device_manager.go
@@ -34,7 +34,7 @@
 }
 
 // IsRootDevice -
-func (dm *DeviceManager) IsRootDevice(deviceID string) (bool, error) {
+func (dm *DeviceManager) IsRootDevice(ctx context.Context, deviceID string) (bool, error) {
 	return false, nil
 }