BIP-0158: add test cases for OP_RETURN with op codes, empty filter

In this commit, we add a new test case for a filter built from a block
that has a transaction with an OP_RETURN which isn't followed by only
push data items. The prior implementation for btcd (which was used to
generated these test vectors), had a stricter check which caused it to
add extra items to the filter. We also add a case of a block that has a
single coinbase transaction, with that transaction having only an
OP_RETURN output. As a result, that filter will be "empty", and is
signalled by by a single zero (0x00) byte.

In order to make building the code that makes the test vectors
reproducible, we've added go.mod and go.sum files as well.

bip-0158/gentestvectors.go

@@ -33,11 +33,13 @@ var (
 		{0, "Genesis block"},
 		{2, ""},
 		{3, ""},
+		{15007, "Tx has non-standard OP_RETURN output followed by opcodes"},
 		{49291, "Tx pays to empty output script"},
 		{180480, "Tx spends from empty output script"},
 		{926485, "Duplicate pushdata 913bcc2be49cb534c20474c4dee1e9c4c317e7eb"},
 		{987876, "Coinbase tx has unparseable output script"},
 		{1263442, "Includes witness data"},
+		{1414221, "Empty data"},
 	}
 
 	defaultBtcdDir         = btcutil.AppDataDir("btcd", false)

bip-0158/go.mod

@@ -0,0 +1,7 @@
+module github.com/bitcoin/bips/bip-0158
+
+require (
+	github.com/btcsuite/btcd v0.0.0-20190115013929-ed77733ec07d
+	github.com/btcsuite/btcutil v0.0.0-20190207003914-4c204d697803
+	github.com/davecgh/go-spew v1.1.1
+)

bip-0158/go.sum

@@ -0,0 +1,54 @@
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