core, h2: send EOR for early HTTP request failure.

core, h2: send EOR for early HTTP request failure.

The core output filters depend on EOR being sent at some point for correct
accounting of setaside limits and lifetime.

Rework ap_read_request() early failure (including in post_read_request() hooks)
so that it always sends the EOR after ap_die().

Apply the same scheme in h2_request_create_rec() which is the HTTP/2 to HTTP/1
counterpart.

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1876664 13f79535-47bb-0310-9956-ffa450edef68