New move file endpoint

[Sriep]

We need a new move file endpoint that moves a file without charging.

Currently goSDK.zboxcore.sdk.allocation.MoveOject

func (a *Allocation) MoveObject(path string, destPath string) error {
    err := a.CopyObject(path, destPath)
    if err != nil {
        return err
    }
    return a.DeleteFile(path)
}

However, a copy charges, so copy and delete cannot be used instead of the free move action.

Add new handler to blobbercore.

Once we have the new move endpoint we will need to update the goSDK file linked above.

[lpoli]

@guruhubb Please comment on this