lnrpc+subserver_cfg: add configs for autopilot sub-server

lnrpc/autopilotrpc/config_active.go

@@ -0,0 +1,17 @@
+// +build autopilotrpc
+
+package autopilotrpc
+
+import (
+	"github.com/lightningnetwork/lnd/autopilot"
+)
+
+// Config is the primary configuration struct for the autopilot RPC server. It
+// contains all the items required for the rpc server to carry out its
+// duties. The fields with struct tags are meant to be parsed as normal
+// configuration options, while if able to be populated, the latter fields MUST
+// also be specified.
+type Config struct {
+	// Manager is the running autopilot manager.
+	Manager *autopilot.Manager
+}

lnrpc/autopilotrpc/config_default.go

@@ -0,0 +1,6 @@
+// +build !autopilotrpc
+
+package autopilotrpc
+
+// Config is empty for non-autopilotrpc builds.
+type Config struct{}

subrpcserver_config.go

@@ -4,6 +4,7 @@ import (
 	"fmt"
 	"reflect"
 
+	"github.com/lightningnetwork/lnd/lnrpc/autopilotrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/signrpc"
 	"github.com/lightningnetwork/lnd/lnrpc/walletrpc"
 	"github.com/lightningnetwork/lnd/macaroons"
@@ -25,6 +26,10 @@ type subRPCServerConfigs struct {
 	// also requests keys and addresses under control of the backing
 	// wallet.
 	WalletKitRPC *walletrpc.Config `group:"walletrpc" namespace:"walletrpc"`
+
+	// AutopilotRPC is a sub-RPC server that exposes methods on the running
+	// autopilot as a gRPC service.
+	AutopilotRPC *autopilotrpc.Config `group:"autopilotrpc" namespace:"autopilotrpc"`
 }
 
 // PopulateDependencies attempts to iterate through all the sub-server configs