fix tikv config

tidb/resources/tikv.conf

@@ -3,10 +3,10 @@ status-addr="0.0.0.0:20180"
 
 [raftstore]
 pd-heartbeat-tick-interval="5s"
-raft_store_max_leader_lease="50ms"
-raft_base_tick_interval="100ms"
-raft_heartbeat_ticks=3
-raft_election_timeout_ticks=10
+raft-store-max-leader-lease="50ms"
+raft-base-tick-interval="100ms"
+raft-heartbeat-ticks=3
+raft-election-timeout-ticks=10
 
 # The default value is true, which means writing the data on the disk
 # compulsorily. If it is not in a business scenario of the financial security