Test sys_vars.thread_cache_size_func is unstable

[Laurynas Biveinis]

On 5.6 trunk:

sys_vars.thread_cache_size_func w3 [ fail ]
        Test ended at 2017-01-23 12:47:54

CURRENT_TEST: sys_vars.thread_cache_size_func
--- /mnt/workspace/percona-server-5.6-trunk/BUILD_TYPE/release/Host/centos7-64/mysql-test/suite/sys_vars/r/thread_cache_size_func.result 2016-12-29 15:06:22.065848447 +0300
+++ /mnt/workspace/percona-server-5.6-trunk/BUILD_TYPE/release/Host/centos7-64/build/mysql-test/var/3/log/thread_cache_size_func.reject 2017-01-23 15:47:54.138613014 +0300
@@ -18,7 +18,7 @@
 ** Disconnecting conn1,conn2,conn3,conn4 **
 SHOW STATUS LIKE 'Threads_cached';
 Variable_name Value
-Threads_cached 3
+Threads_cached 2
 3 Expected
 SET @@GLOBAL.thread_cache_size= 1;
 ** Connecting conn1 using username 'root' **

mysqltest: Result content mismatch

See also https://jira.mariadb.org/browse/MDEV-11775

[Laurynas Biveinis (laurynas-biveinis)]

https://github.com/percona/percona-server/pull/1337
https://github.com/percona/percona-server/pull/1338

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-2227