LP #1626441: ANALYZE TABLE should remove its table from background stat processing queue

**Reported in Launchpad by Laurynas Biveinis last update 01-12-2016 08:29:38

Copy of http://bugs.mysql.com/bug.php?id=71761:

[18 Feb 2014 15:03] Laurynas Biveinis
Description:
1. An InnoDB table receives many updates and is added to the background stats processing queue.
2. Updates stop, an ANALYZE TABLE request comes, and the table stats are recalculated.
3. Some time later, the background stats thread picks up this table and recalculates its stats even though they are already up to date.

How to repeat:
Run write workload on a table, stop it, ANALYZE TABLE, observe the background stats thread recalculating its stats again.

Suggested fix:
One way to fix it is to add dict_stats_recalc_pool_del(ib_table), guarded by dict_mutex_enter/exit_for_mysql(), to ha_innobase::info_low if(is_analyze || innobase_stats_on_metadata).