etcd: disable excessive logging when using embedded etcd

kvdb/etcd/embed.go

@@ -69,6 +69,9 @@ func NewEmbeddedEtcdInstance(path string, clientPort, peerPort uint16) (
 	// To ensure that we can submit large transactions.
 	cfg.MaxTxnOps = 8192
 	cfg.MaxRequestBytes = 16384 * 1024
+	cfg.Debug = false
+	cfg.Logger = "zap"
+	cfg.LogLevel = "error"
 
 	// Listen on random free ports if no ports were specified.
 	if clientPort == 0 {