macaroons: use fast scrypt options in itest and unit tests

macaroons/security.go

@@ -0,0 +1,13 @@
+// +build !rpctest
+
+package macaroons
+
+import "github.com/btcsuite/btcwallet/snacl"
+
+var (
+	// Below are the default scrypt parameters that are used when creating
+	// the encryption key for the macaroon database with snacl.NewSecretKey.
+	scryptN = snacl.DefaultN
+	scryptR = snacl.DefaultR
+	scryptP = snacl.DefaultP
+)