[t:2811], merge handlerton MVCC changes to main line

git-svn-id: file:///svn/mysql/tokudb-engine/tokudb-engine@23498 c7de825b-a66e-492c-adef-691d508d4ae1

storage/tokudb/ha_tokudb.h

@@ -211,6 +211,7 @@ private:
     // instance of cursor being used for init_xxx and rnd_xxx functions
     //
     DBC *cursor;
+    u_int32_t cursor_flags; // flags for cursor
     //
     // flags that are returned in table_flags()
     //
@@ -432,6 +433,7 @@ public:
 
     ha_rows records_in_range(uint inx, key_range * min_key, key_range * max_key);
 
+    u_int32_t get_cursor_isolation_flags(enum thr_lock_type lock_type, THD* thd);
     THR_LOCK_DATA **store_lock(THD * thd, THR_LOCK_DATA ** to, enum thr_lock_type lock_type);
 
     int get_status();

storage/tokudb/hatoku_defines.h

@@ -81,6 +81,7 @@ typedef enum {
     hatoku_iso_not_set = 0,
     hatoku_iso_read_uncommitted,
     hatoku_iso_read_committed,
+    hatoku_iso_repeatable_read,
     hatoku_iso_serializable
 } HA_TOKU_ISO_LEVEL;