Resolve code duplication between GTlsClientConnectionOpenssl/GTlsServerConnectionOpenssl
The following discussion from !128 (merged) should be addressed:
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@mcatanzaro started a discussion: Looks like this function is identical between client/server classes, so it should move to the parent class, right? (Don't fix it in this MR, since it's unrelated; we can just create a new issue so we don't forget.)