lnwire: replace all wire msg tests with a single property-based test

This commit does away with all the old manual message equality tests
and replace it with a single property-based test that uses the
testing/quick package. This test uses a single scenario which MUST hold
for all the messages type and all possible messages generated for those
types. As a result we are able to do away with all the prior manually
generated test data as the fuzzer to scan the input space looking for a
message that violates the scenario.

lnwire/commit_sig_test.go

@@ -1,32 +0,0 @@
-package lnwire
-
-import (
-	"bytes"
-	"reflect"
-	"testing"
-)
-
-func TestCommitSigEncodeDecode(t *testing.T) {
-	commitSignature := &CommitSig{
-		ChanID:    ChannelID(revHash),
-		CommitSig: commitSig,
-	}
-
-	// Next encode the CS message into an empty bytes buffer.
-	var b bytes.Buffer
-	if err := commitSignature.Encode(&b, 0); err != nil {
-		t.Fatalf("unable to encode CommitSig: %v", err)
-	}
-
-	// Deserialize the encoded EG message into a new empty struct.
-	commitSignature2 := &CommitSig{}
-	if err := commitSignature2.Decode(&b, 0); err != nil {
-		t.Fatalf("unable to decode CommitSig: %v", err)
-	}
-
-	// Assert equality of the two instances.
-	if !reflect.DeepEqual(commitSignature, commitSignature2) {
-		t.Fatalf("encode/decode error messages don't match %#v vs %#v",
-			commitSignature, commitSignature2)
-	}
-}