BUG#25549156 - THREAD_POOL VALGRIND FAILURE ON PB 5.7.

Valgrind failures relating to thread pool test suite is
seen on PB2. The failures are a result of OpenSSL
library. The fix is to add valgrind suppressions. This bug
is a backport of the fix for bug#23473989.

Author: thayumanavar77

mysql-test/valgrind.supp

@@ -1,4 +1,4 @@
-# Copyright (c) 2005, 2016, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2005, 2017, Oracle and/or its affiliates. All rights reserved.
 #
 # This program is free software; you can redistribute it and/or
 # modify it under the terms of the GNU Library General Public
@@ -1181,3 +1181,29 @@
    obj:*
 }
 
+{
+  OpenSSL still reachable.
+  Memcheck:Leak
+  match-leak-kinds: reachable
+  fun:malloc
+  fun:CRYPTO_malloc
+  ...
+  fun:ERR_peek_error
+  fun:vio_ssl_read
+  ...
+}
+
+{
+  OpenSSL still reachable.
+  Memcheck:Leak
+  match-leak-kinds: reachable
+  fun:malloc
+  fun:CRYPTO_malloc
+  ...
+  fun:ERR_peek_error
+  ...
+  fun:sslaccept
+  ...
+  fun:server_mpvio_read_packet
+  ...
+}