lnwire: update CommitRevocation for revoke key scheme

With this commit a revocation message now carries 3 items:

  1. A pre-image revoking the lowest unrevoked commitment transaction
in the commitment chain.
  2. A new key which extends the current revocation window by 1. This
key is to be used for new commitment transactions.
  3. A new hash which also extends the current revocation window by 1.
This hash is to be used for new HTLC revocation hashes.

lnwire/commit_revocation_test.go

@@ -7,13 +7,11 @@ import (
 )
 
 func TestCommitRevocationEncodeDecode(t *testing.T) {
-	copy(revocationHash[:], revocationHashBytes)
-	copy(nextHop[:], nextHopBytes)
-
 	cr := &CommitRevocation{
 		ChannelPoint:       outpoint1,
-		Revocation:         revocationHash,
-		NextRevocationHash: nextHop,
+		Revocation:         revHash,
+		NextRevocationKey:  pubKey,
+		NextRevocationHash: revHash,
 	}
 
 	// Next encode the CR message into an empty bytes buffer.