add keep in walCfg

src/inc/twal.h

@@ -36,6 +36,7 @@ typedef struct {
 typedef struct {
   int8_t    commitLog; // commitLog
   int8_t    wals;      // number of WAL files;
+  int8_t    keep;      // keep the wal file when closed
 } SWalCfg;
 
 typedef void* twalh;  // WAL HANDLE