Fix list objects test and remove all the old unnecessary files.

- Fix tests for new changes.
- Change Golang err as 'e' for the time being, before we bring in
  probe removal change.
- Remove old structs and temporary files.

fs.go

@@ -17,10 +17,7 @@
 package main
 
 import (
-	"os"
-	"path/filepath"
 	"sync"
-	"time"
 
 	"github.com/minio/minio/pkg/probe"
 )
@@ -47,28 +44,12 @@ type Filesystem struct {
 	path                        string
 	minFreeDisk                 int64
 	rwLock                      *sync.RWMutex
-	multiparts                  *multiparts
 	listObjectMap               map[listObjectParams][]*treeWalker
 	listObjectMapMutex          *sync.Mutex
 	listMultipartObjectMap      map[listMultipartObjectParams][]multipartObjectInfoChannel
 	listMultipartObjectMapMutex *sync.Mutex
 }
 
-// MultipartSession holds active session information
-type multipartSession struct {
-	TotalParts int
-	ObjectName string
-	UploadID   string
-	Initiated  time.Time
-	Parts      []partInfo
-}
-
-// multiparts collection of many parts
-type multiparts struct {
-	Version       string                       `json:"version"`
-	ActiveSession map[string]*multipartSession `json:"activeSessions"`
-}
-
 func (fs *Filesystem) pushListMultipartObjectCh(params listMultipartObjectParams, ch multipartObjectInfoChannel) {
 	fs.listMultipartObjectMapMutex.Lock()
 	defer fs.listMultipartObjectMapMutex.Unlock()
@@ -108,31 +89,10 @@ func (fs *Filesystem) popListMultipartObjectCh(params listMultipartObjectParams)
 
 // newFS instantiate a new filesystem.
 func newFS(rootPath string) (ObjectAPI, *probe.Error) {
-	setFSMultipartsMetadataPath(filepath.Join(rootPath, "$multiparts-session.json"))
-
-	var err *probe.Error
-	// load multiparts session from disk
-	var mparts *multiparts
-	mparts, err = loadMultipartsSession()
-	if err != nil {
-		if os.IsNotExist(err.ToGoError()) {
-			mparts = &multiparts{
-				Version:       "1",
-				ActiveSession: make(map[string]*multipartSession),
-			}
-			if err = saveMultipartsSession(*mparts); err != nil {
-				return nil, err.Trace()
-			}
-		} else {
-			return nil, err.Trace()
-		}
-	}
-
 	fs := &Filesystem{
 		rwLock: &sync.RWMutex{},
 	}
 	fs.path = rootPath
-	fs.multiparts = mparts
 
 	/// Defaults