filer: change to saveToFilerLimit from cacheToFilerLimit

short circuit saving small files to volume server

weed/server/filer_server.go

@@ -46,18 +46,18 @@ type FilerOption struct {
 	Collection         string
 	DefaultReplication string
 	DisableDirListing  bool
-	MaxMB              int
-	DirListingLimit    int
-	DataCenter         string
-	Rack               string
-	DefaultLevelDbDir  string
-	DisableHttp        bool
-	Host               string
-	Port               uint32
-	recursiveDelete    bool
-	Cipher             bool
-	CacheToFilerLimit  int64
-	Filers             []string
+	MaxMB             int
+	DirListingLimit   int
+	DataCenter        string
+	Rack              string
+	DefaultLevelDbDir string
+	DisableHttp       bool
+	Host              string
+	Port              uint32
+	recursiveDelete   bool
+	Cipher            bool
+	SaveToFilerLimit  int
+	Filers            []string
 }
 
 type FilerServer struct {