VOL-2496 Add "event listen" command to voltctl

Change-Id: I8f1fb34b55f56c8125142ac289e2f19fc170d804
diff --git a/cmd/voltctl/voltctl.go b/cmd/voltctl/voltctl.go
index 54a4cad..02de992 100644
--- a/cmd/voltctl/voltctl.go
+++ b/cmd/voltctl/voltctl.go
@@ -66,6 +66,7 @@
 	commands.RegisterConfigCommands(parser)
 	commands.RegisterComponentCommands(parser)
 	commands.RegisterLogLevelCommands(parser)
+	commands.RegisterEventCommands(parser)
 
 	_, err = parser.Parse()
 	if err != nil {