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_vacuum.go

@@ -0,0 +1,35 @@
+package weed_server
+
+import (
+	"net/http"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+func (vs *VolumeServer) vacuumVolumeCheckHandler(w http.ResponseWriter, r *http.Request) {
+	err, ret := vs.store.CheckCompactVolume(r.FormValue("volume"), r.FormValue("garbageThreshold"))
+	if err == nil {
+		writeJsonQuiet(w, r, http.StatusOK, map[string]interface{}{"error": "", "result": ret})
+	} else {
+		writeJsonQuiet(w, r, http.StatusInternalServerError, map[string]interface{}{"error": err.Error(), "result": false})
+	}
+	glog.V(2).Infoln("checked compacting volume =", r.FormValue("volume"), "garbageThreshold =", r.FormValue("garbageThreshold"), "vacuum =", ret)
+}
+func (vs *VolumeServer) vacuumVolumeCompactHandler(w http.ResponseWriter, r *http.Request) {
+	err := vs.store.CompactVolume(r.FormValue("volume"))
+	if err == nil {
+		writeJsonQuiet(w, r, http.StatusOK, map[string]string{"error": ""})
+	} else {
+		writeJsonError(w, r, http.StatusInternalServerError, err)
+	}
+	glog.V(2).Infoln("compacted volume =", r.FormValue("volume"), ", error =", err)
+}
+func (vs *VolumeServer) vacuumVolumeCommitHandler(w http.ResponseWriter, r *http.Request) {
+	err := vs.store.CommitCompactVolume(r.FormValue("volume"))
+	if err == nil {
+		writeJsonQuiet(w, r, http.StatusOK, map[string]string{"error": ""})
+	} else {
+		writeJsonError(w, r, http.StatusInternalServerError, err)
+	}
+	glog.V(2).Infoln("commit compact volume =", r.FormValue("volume"), ", error =", err)
+}