API mis-parses secure_auth parameter

* MySQL 5.6.23 client with --secure-auth=FALSE

[root@centos63 mysql4]# mysql -umirfan -p -S /tmp/mysql_mirfan.sock --secure-auth=FALSE
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 16
Server version: 4.0.30

Copyright (c) 2009-2015 Percona LLC and/or its affiliates
Copyright (c) 2000, 2015, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
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owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> \s
--------------
mysql Ver 14.14 Distrib 5.6.23-72.1, for Linux (x86_64) using EditLine wrapper

Connection id: 16
Current database:
Current user: mirfan@localhost
SSL: Not in use
Current pager: stdout
Using outfile: ''
Using delimiter: ;
Server version: 4.0.30
Protocol version: 10
Connection: Localhost via UNIX socket
ERROR 1193 (HY000): Unknown system variable 'character_set_client'
ERROR 1193 (HY000): Unknown system variable 'character_set_client'
Client characterset: utf8
Server characterset: utf8
UNIX socket: /tmp/mysql_mirfan.sock
Uptime: 8 min 21 sec

Threads: 1 Questions: 18 Slow queries: 0 Opens: 11 Flush tables: 1 Open tables: 0 Queries per second avg: 0.036
--------------

[root@centos63 mysql4]# perl -v
This is perl, v5.10.1 (*) built for x86_64-linux-thread-multi
Copyright 1987-2009, Larry Wall

[root@centos63 mysql4]# cat /tmp/75430.cnf
[client]
host = localhost
port = 15000
user = mirfan
password = 123
secure_auth = FALSE
socket=/tmp/mysql_mirfan.sock

[root@centos63 mysql4]# perl -MDBI -E'DBI->connect(q{DBI:mysql:test;mysql_read_default_file=/tmp/75430.cnf})'
DBI connect('test;mysql_read_default_file=/tmp/75430.cnf','',...) failed: Connection using old (pre-4.1.1) authentication protocol refused (client option 'secure_auth' enabled) at -e line 1

* With skip_secure_auth

[root@centos63 mysql4]# cat /tmp/75430.cnf
[client]
host = localhost
port = 15000
user = mirfan
password = 123
skip-secure-auth
socket=/tmp/mysql_mirfan.sock

[root@centos63 mysql4]# perl -MDBI -E'DBI->connect(q{DBI:mysql:test;mysql_read_default_file=/tmp/75430.cnf})'
[root@centos63 mysql4]#

Percona now uses JIRA for bug reports so this bug report is migrated to: https://jira.percona.com/browse/PS-856