Use verify callback before checking dates

[embhorn]

Description

In wolfSSL_X509_verify_cert, after an error has been set is can be overwritten by the subsequent date check. If the callback is being used to override date errors, then the invalid cert gets treated as verified. This change adds a call to the verify callback before the date check. This way the application can handle the error(s) appropriately.

Fixes zd18433

Testing

Set system time to before cert validity of ./certs/intermediate/ca-int2-cert.pem. Call X509_verify_cert, similar to test_X509_STORE_untrusted_certs test. Observe ASN_SIGNER_ERROR being overwritten with date error.

Checklist

• added tests
• updated/added doxygen
• updated appropriate READMEs
• Updated manual and documentation

[embhorn]

retest this please
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