Test change_user_notembedded is unstable

[Laurynas Biveinis]

On 5.6 trunk:

main.change_user_notembedded w4 [ fail ]
        Test ended at 2016-08-26 09:12:35

CURRENT_TEST: main.change_user_notembedded
mysqltest: At line 24: query 'change_user foo,bar' failed with wrong errno 2013: 'Lost connection to MySQL server at 'reading authorization packet', system error: 110', instead of 1045...

The result from queries just before the failure was:
ERROR 28000: Access denied for user 'foo'@'localhost' (using password: YES)
Got one of the listed errors
ERROR 28000: Access denied for user 'foo'@'localhost' (using password: YES)
ERROR 28000: Access denied for user 'foo'@'localhost' (using password: YES)
safe_process[14975]: Child process: 14976, exit: 1

Server [mysqld.1 - pid: 14489, winpid: 14489] log:
Server log from this test:
----------SERVER LOG START-----------
----------SERVER LOG END-------------

[Laurynas Biveinis (laurynas-biveinis)]

     https://github.com/percona/percona-server/pull/984
     https://github.com/percona/percona-server/pull/985

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-2195