Last time, commit b9f579317 (MDEV-9101) has updated HA_ERR_LAST, breaking the
rocksdb error codes. According to the commit history, this happens each time a
new HA error is added.
This patch fixes the range to start from '500', hopefully resolving the problem
for the close future.
In addition, fix incorrect error codes enumeration.
Support Create_time and Update_time for MyRocks tables.
- Create_time is stored in the MyRocks' internal data dictionary.
- Update_time is in-memory only (like in InnoDB).