kvdb: move channeldb/kvdb to top level

kvdb/kvdb_etcd.go

@@ -0,0 +1,21 @@
+// +build kvdb_etcd
+
+package kvdb
+
+import (
+	"github.com/lightningnetwork/lnd/kvdb/etcd"
+)
+
+// TestBackend is conditionally set to etcd when the kvdb_etcd build tag is
+// defined, allowing testing our database code with etcd backend.
+const TestBackend = EtcdBackendName
+
+// GetEtcdTestBackend creates an embedded etcd backend for testing
+// storig the database at the passed path.
+func StartEtcdTestBackend(path string, clientPort, peerPort uint16) (
+	*etcd.Config, func(), error) {
+
+	return etcd.NewEmbeddedEtcdInstance(
+		path, clientPort, peerPort,
+	)
+}