lncfg+lnd: prefix etcd db with only network name instead of full path

config.go

@@ -1102,6 +1102,10 @@ func (c *Config) localDatabaseDir() string {
 		normalizeNetwork(activeNetParams.Name))
 }
 
+func (c *Config) networkName() string {
+	return normalizeNetwork(activeNetParams.Name)
+}
+
 // CleanAndExpandPath expands environment variables and leading ~ in the
 // passed path, cleans the result, and returns it.
 // This function is taken from https://github.com/btcsuite/btcd