scaffold: add YugabyteDB

weed/command/scaffold.go

@@ -121,7 +121,7 @@ connection_max_open = 100
 connection_max_lifetime_seconds = 0
 interpolateParams = false
 
-[postgres] # or cockroachdb
+[postgres] # or cockroachdb, YugabyteDB
 # CREATE TABLE IF NOT EXISTS filemeta (
 #   dirhash     BIGINT,
 #   name        VARCHAR(65535),