Merge of r1426802,1744460,1829799,1824716,1838318,1840678,1861294
*) easy patches to synch 2.4.x and trunk: - core: extend description of r->hostname - mod_proxy_http: Avoid memory allocation before making sure that this handler can handle the URL - core: Save a few cycles in 'ap_parse_form_data()' - mod_cache_socache: Save some cycles - mod_proxy_ftp: Save some cycle - vhost: move an assignment to the end of the loop to ease readability and please a compiler - core: Be a little more verbose when an error in trigerred in 'ap_set_file_slot()'