mod_ssl: add support for subjectAltName-based host name checking in proxy mode
(PR 54030)

factor out code from ssl_engine_init.c:ssl_check_public_cert()
to ssl_util_ssl.c:SSL_X509_match_name()

introduce new SSLProxyCheckPeerName directive, which should eventually
obsolete SSLProxyCheckPeerCN

ssl_engine_io.c:ssl_io_filter_handshake(): avoid code duplication
when aborting with HTTP_BAD_GATEWAY


Fix warning about discarding 'const' qualifier from pointer

Submitted by: kbrand, sf
Reviewed/backported by: jim


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Fix use of trailing slashes in proxy
balancer and member URLs and add a little
explanation.

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trunk patch: http://svn.apache.org/r1482996
Submitted by: minfrin
Reviewed by: covener, jailletc36


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trunk patch: http://svn.apache.org/r1433682
Submitted by: Tianyin Xu <tixu cs.ucsd.edu>
Reviewed by: minfrin, jailletc36, sf


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trunk patch: http://svn.apache.org/r1476645
Submitted by: Diego Santa Cruz <diego.santaCruz spinetix.com>
Reviewed by: minfrin, covener, sf


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PR 54384

trunk patch: http://svn.apache.org/r1433613
Submitted by: jailletc36
Reviewed by: minfrin, jim


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