Purge the logs when we reach the EOF for the last wal file when replication

2019-05-30 14:59:38,426 WARN  [RS:1;zhangduo-ubuntu:39885.replicationSource.wal-reader.zhangduo-ubuntu%2C39885%2C1559199556433,2] wal.ProtobufLogReader(422): Encountered a malformed edit, seeking back to last good position in file, from 2459 to 2459
java.io.EOFException: First byte is negative at offset 2459
	at org.apache.hadoop.hbase.regionserver.wal.ProtobufLogReader.readNext(ProtobufLogReader.java:347)
	at org.apache.hadoop.hbase.regionserver.wal.ReaderBase.next(ReaderBase.java:98)
	at org.apache.hadoop.hbase.regionserver.wal.ReaderBase.next(ReaderBase.java:86)
	at org.apache.hadoop.hbase.replication.regionserver.WALEntryStream.readNextEntryAndRecordReaderPosition(WALEntryStream.java:263)
	at org.apache.hadoop.hbase.replication.regionserver.WALEntryStream.tryAdvanceEntry(WALEntryStream.java:176)
	at org.apache.hadoop.hbase.replication.regionserver.WALEntryStream.hasNext(WALEntryStream.java:101)
	at org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReader.readWALEntries(ReplicationSourceWALReader.java:195)
	at org.apache.hadoop.hbase.replication.regionserver.ReplicationSourceWALReader.run(ReplicationSourceWALReader.java:138)