remove tmp file generated by test (#4691)
remove tmp file generated by test (#4691)

Signed-off-by: Ryan Leung <98ca95cd24c810cea97a0e53f67d648652b7b2cf@gmail.com>
pingcap/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,BusyJay/tikv,c4pt0r/tikv,pingcap/tikv