Add an End-to-End workflow for FUSE mount (#3562)

* Add an e2e workflow to test FUSE mount

* Fix deadlocks during concurrent r/w

weed/mount/weedfs_file_read.go

@@ -39,8 +39,8 @@ func (wfs *WFS) Read(cancel <-chan struct{}, in *fuse.ReadIn, buff []byte) (fuse
 		return nil, fuse.ENOENT
 	}
 
-	fh.entryLock.Lock()
-	defer fh.entryLock.Unlock()
+	fh.Lock()
+	defer fh.Unlock()
 
 	offset := int64(in.Offset)
 	totalRead, err := readDataByFileHandle(buff, fh, offset)