After upgrade WolfSSL from version 3.13 to 3.14 some tests started to fail, so they were disabled.
With this fix I re-enable the tests and they succeed.

Here is the description of the problems and how it was fixed.
1. wolfSSL_ERR_get_error_line_data
it returns unsigned int but the functions it calls return unsigned int. Returning 0 in case of negative value.
2. Certificate parsing - the resulted string lacked the equal sign
3. viossl - uninitialized values (Thomasz contribution)
4. viosslfactories - delaying the call to SSL_CTX_set_options (Thomasz contribution)