Well, now I know what the bio_is_renegotiating call was for.

Place a big-ass comment there so that whomever comes next isn't stuck
at a cryptic call that they don't understand with a dinky comment.
Hopefully, this makes sense.  Someone more familiar with OpenSSL should
verify the comment.

This fix also requires the normalize call to be performed before
churn_input so that we don't enter churn_input with a 0-length ctx->b
brigade.

All httpd-test tests (except for the module/negotiation test) pass now.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@91442 13f79535-47bb-0310-9956-ffa450edef68