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/storage/store_vacuum.go

@@ -0,0 +1,44 @@
+package storage
+
+import (
+	"fmt"
+	"strconv"
+
+	"github.com/chrislusf/seaweedfs/weed/glog"
+)
+
+func (s *Store) CheckCompactVolume(volumeIdString string, garbageThresholdString string) (error, bool) {
+	vid, err := NewVolumeId(volumeIdString)
+	if err != nil {
+		return fmt.Errorf("Volume Id %s is not a valid unsigned integer", volumeIdString), false
+	}
+	garbageThreshold, e := strconv.ParseFloat(garbageThresholdString, 32)
+	if e != nil {
+		return fmt.Errorf("garbageThreshold %s is not a valid float number", garbageThresholdString), false
+	}
+	if v := s.findVolume(vid); v != nil {
+		glog.V(3).Infoln(vid, "garbage level is", v.garbageLevel())
+		return nil, garbageThreshold < v.garbageLevel()
+	}
+	return fmt.Errorf("volume id %d is not found during check compact", vid), false
+}
+func (s *Store) CompactVolume(volumeIdString string) error {
+	vid, err := NewVolumeId(volumeIdString)
+	if err != nil {
+		return fmt.Errorf("Volume Id %s is not a valid unsigned integer", volumeIdString)
+	}
+	if v := s.findVolume(vid); v != nil {
+		return v.Compact()
+	}
+	return fmt.Errorf("volume id %d is not found during compact", vid)
+}
+func (s *Store) CommitCompactVolume(volumeIdString string) error {
+	vid, err := NewVolumeId(volumeIdString)
+	if err != nil {
+		return fmt.Errorf("Volume Id %s is not a valid unsigned integer", volumeIdString)
+	}
+	if v := s.findVolume(vid); v != nil {
+		return v.commitCompact()
+	}
+	return fmt.Errorf("volume id %d is not found during commit compact", vid)
+}