Support multiple module dependencies for the final prereq argument to the
APACHE_MODULE macro, as a comma separated list, e.g.

APACHE_MODULE(proxy_http2, [...], [proxy,http2])

will evaluate the availability of mod_proxy, followed by mod_http2

Submitted by: wrowe
Reviewed/backported by: jim


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mod_http2: fixing APLOG_NO overdose and some log levels


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assign IDs to new AH*'s



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spatch some AH* IDs to pick up the new INFO level messages,
also hit old DEBUG messages.




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mod_proxy_http2: fixed retry behaviour when proxy engine needs to retry its base request on a new connection



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If enable_proxy_hcheck is unset handle it like other proxy modules


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Merge r1749151 from trunk:

mod_http2: fix for request abort when connections drops, introduced in 1.5.8
Submitted by: icing
Reviewed/backported by: jim


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Fix a potential buffer overflow.
Submitted by: jailletc36
Reviewed/backported by: jim


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mod_http2: more rigid error handling in DATA frame assembly



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