raftstore: add more seek and seek_for_prev test (#3722)
raftstore: add more seek and seek_for_prev test (#3722)

* add more seek and seek_prev test

Signed-off-by: Connor1996 <f7e3376ac32ecd54ff96995c24a9472cac06d4cb@gmail.com>


BusyJay/tikv,BusyJay/tikv,c4pt0r/tikv,pingcap/tikv,pingcap/tikv,BusyJay/tikv,BusyJay/tikv