createDir: Incorrect values are saved in reference_objects and break challenge

[cnlangzi]

blobber/code/go/0chain.net/blobbercore/allocation/newfilechange.go

Line 89 in 7370c1e

newDir.ActualFileSize = 2

It should be

newDir.ActualFileSize = 0
newDir.Size = 0
newDir.NumBlocks = 0

Because it is new empty directory.

[cnlangzi]

CalculateHash should be updated too. A empty directory node should be removed from CalculateHash. Because An empty directory breaks LastWriteMarker on blockchain if there is no any transaction is committed to blockchain. And Challenge is broken. the hash of empty directory node is r.Hash = encryption.Hash(strings.Join(childHashes, ":")) now

[cnlangzi]

after code review, it is completed wrong to create directory directly on local file system

blobber/code/go/0chain.net/blobbercore/filestore/fs_store.go

Line 184 in 0c5de39

func createDirs(dir string) error {