config: add new command line param --defaultchanconfs

This commit adds a new command line option that allows clients to
specify a default value to use when responding to a new channel funding
request. In a future change, a pure mapping will be added, with the
command line option having higher precedence.

config.go

@@ -30,6 +30,7 @@ const (
 	defaultPeerPort           = 5656
 	defaultRPCHost            = "localhost"
 	defaultMaxPendingChannels = 1
+	defaultNumChanConfs       = 1
 )
 
 var (
@@ -96,6 +97,8 @@ type config struct {
 	Litecoin *chainConfig `group:"Litecoin" namespace:"litecoin"`
 	Bitcoin  *chainConfig `group:"Bitcoin" namespace:"bitcoin"`
 
+	DefaultNumChanConfs int `long:"defaultchanconfs" description:"The default number of confirmations a channel must have before it's considered open."`
+
 	NeutrinoMode *neutrinoConfig `group:"neutrino" namespace:"neutrino"`
 }
 
@@ -109,14 +112,15 @@ type config struct {
 // 	4) Parse CLI options and overwrite/add any specified options
 func loadConfig() (*config, error) {
 	defaultCfg := config{
-		ConfigFile:         defaultConfigFile,
-		DataDir:            defaultDataDir,
-		DebugLevel:         defaultLogLevel,
-		LogDir:             defaultLogDir,
-		PeerPort:           defaultPeerPort,
-		RPCPort:            defaultRPCPort,
-		RESTPort:           defaultRESTPort,
-		MaxPendingChannels: defaultMaxPendingChannels,
+		ConfigFile:          defaultConfigFile,
+		DataDir:             defaultDataDir,
+		DebugLevel:          defaultLogLevel,
+		LogDir:              defaultLogDir,
+		PeerPort:            defaultPeerPort,
+		RPCPort:             defaultRPCPort,
+		RESTPort:            defaultRESTPort,
+		MaxPendingChannels:  defaultMaxPendingChannels,
+		DefaultNumChanConfs: defaultNumChanConfs,
 		Bitcoin: &chainConfig{
 			RPCHost: defaultRPCHost,
 			RPCCert: defaultBtcdRPCCertFile,

lnd.go

@@ -162,7 +162,7 @@ func lndMain() error {
 			// TODO(roasbeef): add configurable mapping
 			//  * simple switch initially
 			//  * assign coefficient, etc
-			return 1
+			return uint16(cfg.DefaultNumChanConfs)
 		},
 		RequiredRemoteDelay: func(chanAmt btcutil.Amount) uint16 {
 			// TODO(roasbeef): add additional hooks for