Report a readable error on a duplicate cert in ca app
Commit 87e8feca (16 years ago!) introduced a bug where if we are attempting to insert a cert with a duplicate subject name, and duplicate subject names are not allowed (which is the default), then we get an unhelpful error message back (error number 2). Prior to that commit we got a helpful error message which displayed details of the conflicting entry in the database. That commit was itself attempting to fix a bug with the noemailDN option where we were setting the subject field in the database too early (before extensions had made any amendments to it). This PR moves the check for a conflicting Subject name until after all changes to the Subject have been made by extensions etc. This also, co-incidentally Fixes the ca crashing bug described in issue 5109. Fixes #5109 Reviewed-by:Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5445)
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