get rid of 'apctx' table that used to live in SSL_get_app_data2(ssl)

change app_data2 to be the request_rec itself.
if something needs per-request context in the future,
it can use r->request_config

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git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk/modules/ssl@92113 13f79535-47bb-0310-9956-ffa450edef68