test percona_show_temp_tables_stress is unstable

[Laurynas Biveinis]

On 5.5 trunk debug with ASan:

main.percona_show_temp_tables_stress w4 [ fail ]
        Test ended at 2016-07-27 16:52:45

CURRENT_TEST: main.percona_show_temp_tables_stress
mysqltest: At line 48: query 'KILL QUERY $con1_id' failed: 1094: Unknown thread id: 46

The result from queries just before the failure was:
CREATE PROCEDURE query_temp_tables ()
WHILE TRUE DO
SELECT * FROM INFORMATION_SCHEMA.GLOBAL_TEMPORARY_TABLES;
END WHILE|
CALL query_temp_tables();
# Creating 400 temp tables with each of MyISAM, InnoDB, MEMORY
SELECT COUNT(*) FROM INFORMATION_SCHEMA.GLOBAL_TEMPORARY_TABLES;
COUNT(*)
1200
# Dropping the temp tables
KILL QUERY $con1_id

[Laurynas Biveinis (laurynas-biveinis)]

    https://github.com/percona/percona-server/pull/729
    https://github.com/percona/percona-server/pull/730
    https://github.com/percona/percona-server/pull/731

[Laurynas Biveinis (laurynas-biveinis)]

     https://github.com/percona/percona-server/pull/779
     https://github.com/percona/percona-server/pull/780
     https://github.com/percona/percona-server/pull/781

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-2163