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

Change-Id: I2eb23a374b548d13b3e47d5f65d6d37d14419e32
diff --git a/pkg/kafka/client.go b/pkg/kafka/client.go
index fdc05bc..afc2955 100755
--- a/pkg/kafka/client.go
+++ b/pkg/kafka/client.go
@@ -77,4 +77,5 @@
 	SendLiveness(ctx context.Context) error
 	EnableLivenessChannel(ctx context.Context, enable bool) chan bool
 	EnableHealthinessChannel(ctx context.Context, enable bool) chan bool
+	ListTopics(ctx context.Context) ([]string, error)
 }