Unsuppressed Valgrind warning on plugin_auth_qa_2

[Laurynas Biveinis]

On 5.5 trunk, with Valgrind support:

parts.partition_float_innodb w4 [ pass ] 532993
worker[4] Valgrind report from /mnt/workspace/percona-server-5.5-valgrind/BUILD_TYPE/valgrind/Host/ubuntu-xenial-64bit/mysql-test/var/4/log/mysqld.1.err after tests:
 main.plugin_auth_qa_2
--------------------------------------------------------------------------
HEAP SUMMARY:
    in use at exit: 30,644,352 bytes in 222 blocks
  total heap usage: 69,000 allocs, 68,778 frees, 105,913,699 bytes allocated

32 bytes in 1 blocks are still reachable in loss record 5 of 140
   at 0x4C2FB55: calloc (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
   by 0x56AC626: _dlerror_run (dlerror.c:141)
   by 0x56ABFFE: dlclose (dlclose.c:46)
   by 0x5AC078: free_plugin_mem (sql_plugin.cc:430)
   by 0x5AC078: plugin_dl_del(st_mysql_lex_string const*) (sql_plugin.cc:660)
   by 0x5AE8DB: plugin_del(st_plugin_int*) (sql_plugin.cc:968)
   by 0x5AEB9B: reap_plugins() (sql_plugin.cc:1011)
   by 0x5B003B: plugin_shutdown() (sql_plugin.cc:1660)
   by 0x509AE1: clean_up(bool) (mysqld.cc:1557)
   by 0x50A3B5: unireg_end() (mysqld.cc:1468)
   by 0x50F6DD: kill_server(void*) (mysqld.cc:1396)
   by 0x50F850: kill_server_thread (mysqld.cc:1419)
   by 0x83F67B: pfs_spawn_thread (pfs.cc:1015)
   by 0x525D6F9: start_thread (pthread_create.c:333)
   by 0x6704B5C: clone (clone.S:109)

LEAK SUMMARY:
   definitely lost: 0 bytes in 0 blocks
   indirectly lost: 0 bytes in 0 blocks
     possibly lost: 0 bytes in 0 blocks
   still reachable: 32 bytes in 1 blocks
        suppressed: 30,644,320 bytes in 221 blocks

[Laurynas Biveinis (laurynas-biveinis)]

     https://github.com/percona/percona-server/pull/873
     https://github.com/percona/percona-server/pull/874
     https://github.com/percona/percona-server/pull/875

[Shahriyar Rzayev (rzayev-sehriyar)]

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-2177