Alik's patch for BUG#22306: STOP INSTANCE can not be applied for
instances in Crashed, Failed and Abandoned" to ease review process.
Evaluate global variable linuxthreads before starting threads to avoid
a race.
- WL#3158: IM: Instance configuration extensions;
- WL#3159: IM: --bootstrap and --start-default-instance modes
The following new statements have been added:
- CREATE INSTANCE;
- DROP INSTANCE;
The behaviour of the following statements have been changed:
- SET;
- UNSET;
- FLUSH INSTANCES;
- SHOW INSTANCES;
- SHOW INSTANCE OPTIONS;
