directory structure change to work with glide

glide has its own requirements. My previous workaround caused me some
code checkin errors. Need to fix this.

weed/server/volume_server_handlers.go

@@ -0,0 +1,57 @@
+package weed_server
+
+import (
+	"net/http"
+
+	"github.com/chrislusf/seaweedfs/weed/stats"
+)
+
+/*
+
+If volume server is started with a separated public port, the public port will
+be more "secure".
+
+Public port currently only supports reads.
+
+Later writes on public port can have one of the 3
+security settings:
+1. not secured
+2. secured by white list
+3. secured by JWT(Json Web Token)
+
+*/
+
+func (vs *VolumeServer) privateStoreHandler(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case "GET":
+		stats.ReadRequest()
+		vs.GetOrHeadHandler(w, r)
+	case "HEAD":
+		stats.ReadRequest()
+		vs.GetOrHeadHandler(w, r)
+	case "DELETE":
+		stats.DeleteRequest()
+		vs.guard.WhiteList(vs.DeleteHandler)(w, r)
+	case "PUT":
+		stats.WriteRequest()
+		vs.guard.WhiteList(vs.PostHandler)(w, r)
+	case "POST":
+		stats.WriteRequest()
+		vs.guard.WhiteList(vs.PostHandler)(w, r)
+	}
+}
+
+func (vs *VolumeServer) publicReadOnlyHandler(w http.ResponseWriter, r *http.Request) {
+	switch r.Method {
+	case "GET":
+		stats.ReadRequest()
+		vs.GetOrHeadHandler(w, r)
+	case "HEAD":
+		stats.ReadRequest()
+		vs.GetOrHeadHandler(w, r)
+	}
+}
+
+func (vs *VolumeServer) faviconHandler(w http.ResponseWriter, r *http.Request) {
+	vs.FaviconHandler(w, r)
+}