Test sys_vars.innodb_buffer_pool_load_now_basic is unstable

[Laurynas Biveinis]

On PS 5.6 trunk:

sys_vars.innodb_buffer_pool_load_now_basic w3 [ fail ]
        Test ended at 2016-09-07 09:18:45

CURRENT_TEST: sys_vars.innodb_buffer_pool_load_now_basic
mysqltest: At line 23: command "file_exists" failed with error 1. my_errno=2

The result from queries just before the failure was:
SET @orig = @@global.innodb_buffer_pool_load_now;
SELECT @orig;
@orig
0
SET GLOBAL innodb_buffer_pool_dump_now = ON;
safe_process[21940]: Child process: 21941, exit: 1

Server [mysqld.1 - pid: 21880, winpid: 21880] log:
Server log from this test:
----------SERVER LOG START-----------
2016-09-07 16:18:45 7f989ebfe700 InnoDB: Dumping buffer pool(s) to .//ib_buffer_pool
2016-09-07 16:18:45 7f989ebfe700 InnoDB: Buffer pool(s) dump completed at 160907 16:18:45
----------SERVER LOG END-------------

[Laurynas Biveinis (laurynas-biveinis)]

     https://github.com/percona/percona-server/pull/1034
     https://github.com/percona/percona-server/pull/1035

[Laurynas Biveinis (laurynas-biveinis)]

See bug 1659218

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-3561