merge from trunk:removing HTTP_HEADER output filter on upgraded connections, so timeouts do not send http/1.1 responses any more

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h2_from_h1: To avoid any further confusion, r->err_headers should be cleared
once merged into r->headers_out.


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mod_http2: merged from trunk, sending out push promises *before* the stream response to make client handling of preload links easier

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Save a few bytes in conf pool.
Submitted by: jailletc36
Reviewed/backported by: jim


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Use 'ap_pbase64decode' to simplify code.

Silent a sparse Warning.

cid->ecb->lpszLogData can not be NULL.
It is defined in mod_isapi.h as:
typedef struct EXTENSION_CONTROL_BLOCK {
...
    char           lpszLogData[80];
...
Submitted by: jailletc36
Reviewed/backported by: jim


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using c->master for ssl var lookups when c holds no valid SSLConnRec. Fixes PR58666.
Submitted by: icing
Reviewed/backported by: jim


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Fix the use of the default 'flush' provider.
Improve documentation for the "flusher" parameter.
Remove useless empty lines.

See http://mail-archives.apache.org/mod_mbox/httpd-dev/200812.mbox/%3C494226C0.4050407@force-elite.com%3E for some more explanation.
A python script is given there to test.
I had to tweak it to have it work
(use:
        fd, payload = passfd.recvfd(conn.fileno())
instead of:
        fd = passfd.recvfd(conn.fileno())
)


This is a r1058621 regression, where somehow "char *flusher" has been turned into a "char flusher[]". So it is been broken since the beginning of 2.4.x

After this change (i.e. r1058621), 'flusher' is no more a pointer (NULL'ed when the structure it belongs to is created) but the address of an array within a structure. It can not be NULL anymore.
So, we now have to look at the content of the array itself to see if it has been initialized or if we have to use the default value instead.
Submitted by: jailletc36
Reviewed/backported by: jim


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