multi: add new NoRevLogAmtData config option

In this commit, a new `--db.no-rev-log-amt-data` flag is added. The
config option is passed though to everywhere that it will be used. Note
that it is still a no-op in this commit. An upcoming commit will make
use of the flag.

channeldb/revocation_log.go

@@ -211,7 +211,7 @@ type RevocationLog struct {
 // disk. It also saves our output index and their output index, which are
 // useful when creating breach retribution.
 func putRevocationLog(bucket kvdb.RwBucket, commit *ChannelCommitment,
-	ourOutputIndex, theirOutputIndex uint32) error {
+	ourOutputIndex, theirOutputIndex uint32, noAmtData bool) error {
 
 	// Sanity check that the output indexes can be safely converted.
 	if ourOutputIndex > math.MaxUint16 {