LP #1660339: Bogus client SSL error messages produced using SSL_get_error not ERR_get_error error code

**Reported in Launchpad by Laurynas Biveinis last update 14-06-2017 08:19:58

On 5.6 trunk:

main.ssl-big w4 [ fail ]
Test ended at 2017-01-27 07:57:46

CURRENT_TEST: main.ssl-big
mysqltest: At line 54: query 'connect ssl_con2,localhost,root,,,,,SSL' failed: 2026: SSL connection error: error:00000001:lib(0):func(0):reason(1)

The "error:00000001:lib(0):func(0):reason(1)" part comes from ERR_error_string API, which requires ERR_get_error-returned arg, but is passed SSL_get_error-returned arg instead. The return codes of these two functions have nothing in common, and the resulting error message is bogus.

This is likely the reason for https://bugs.mysql.com/bug.php?id=75311 too.