WL#3244 "CSV engine: convert mmap to read/write calls"

mysql-test/r/csv.result:
  Correct result file
storage/csv/ha_tina.cc:
   Get rid of mmap in tina. Use usual reads/writes
   to access the file.
storage/csv/ha_tina.h:
    Add Transparent_file class, which hides details of access
    to the file. Perform a cleanup & add new functions.

mysql-test/r/csv.result

@@ -4944,10 +4944,10 @@ val
 UPDATE  bug13894 SET val=6 WHERE val=10;
 SELECT * FROM bug13894;
 val
+6
+6
 5
 11
-6
-6
 DROP TABLE bug13894;
 DROP TABLE IF EXISTS bug14672;
 CREATE TABLE bug14672 (c1 integer) engine = CSV;