graph/db: version ChannelID lookup

Add a gossip version parameter to the ChannelID method (outpoint to
short channel ID lookup) in the Store interface and both KV/SQL
implementations. Update the VersionedGraph wrapper and tests.

graph/db/kv_store.go

@@ -1998,7 +1998,13 @@ func (c *KVStore) DeleteChannelEdges(v lnwire.GossipVersion,
 // ChannelID attempt to lookup the 8-byte compact channel ID which maps to the
 // passed channel point (outpoint). If the passed channel doesn't exist within
 // the database, then ErrEdgeNotFound is returned.
-func (c *KVStore) ChannelID(chanPoint *wire.OutPoint) (uint64, error) {
+func (c *KVStore) ChannelID(v lnwire.GossipVersion,
+	chanPoint *wire.OutPoint) (uint64, error) {
+
+	if v != lnwire.GossipVersion1 {
+		return 0, ErrVersionNotSupportedForKVDB
+	}
+
 	var chanID uint64
 	if err := kvdb.View(c.db, func(tx kvdb.RTx) error {
 		var err error