Use root level certificate verification callback in OpenSSL #1818
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We were previously using a callback that would be called after openssl did all of its verification internally. This resulted in multiple callbacks. Instead, we can just completely replace OpenSSL's verification. We then can decide to call openssl's verification directly or windows cert store verification depending on OS and sec config flags. This will always result in just a single callback to the app layer, but otherwise results in no actual behavior changes.
Closes #1810