kvdb: move channeldb/kvdb to top level

kvdb/kvdb_no_etcd.go

@@ -0,0 +1,22 @@
+// +build !kvdb_etcd
+
+package kvdb
+
+import (
+	"fmt"
+
+	"github.com/lightningnetwork/lnd/kvdb/etcd"
+)
+
+// TestBackend is conditionally set to bdb when the kvdb_etcd build tag is
+// not defined, allowing testing our database code with bolt backend.
+const TestBackend = BoltBackendName
+
+var errEtcdNotAvailable = fmt.Errorf("etcd backend not available")
+
+// StartEtcdTestBackend  is a stub returning nil, and errEtcdNotAvailable error.
+func StartEtcdTestBackend(path string, clientPort, peerPort uint16) (
+	*etcd.Config, func(), error) {
+
+	return nil, func() {}, errEtcdNotAvailable
+}