[VOL-4663] create voltha event topic (voltha.events) with conifgurable no of partitions and replication factor

Change-Id: I55b40d97afaed0d75240fd6557f26da90950f6c5
diff --git a/rw_core/config/config.go b/rw_core/config/config.go
index 4375b9b..0f154f6 100644
--- a/rw_core/config/config.go
+++ b/rw_core/config/config.go
@@ -37,6 +37,8 @@
 	KVStoreTimeout              time.Duration
 	KVStoreAddress              string
 	EventTopic                  string
+	EventTopicPartitions        int
+	EventTopicReplicas          int
 	LogLevel                    string
 	Banner                      bool
 	DisplayVersionOnly          bool
@@ -85,6 +87,16 @@
 		"voltha.events",
 		"RW Core Event topic")
 
+	fs.IntVar(&cf.EventTopicPartitions,
+		"EventTopicPartitions",
+		3,
+		"RW Core Event topic partitions")
+
+	fs.IntVar(&cf.EventTopicReplicas,
+		"EventTopicReplicas",
+		1,
+		"RW Core Event topic replicas")
+
 	fs.StringVar(&cf.KVStoreType,
 		"kv_store_type",
 		EtcdStoreName,