merge r3452, r3462, r3471, r3472: fix miscellaneous name bugs: *) fix $upstream_http_ variable prefix length *) use a right "Location" header name, however, it did not harm, since ngx_http_variable_sent_location() never use key name field *) fix proxy_redirect name in error message *) "proxy_redirect default" may not be used if a proxy_pass uses variables

ngx_addon_name=ngx_mysql

HTTP_MODULES="$HTTP_MODULES ngx_http_mysql_test_module"

HTTP_INCS="$HTTP_INCS $ngx_addon_dir"
HTTP_DEPS="$HTTP_DEPS $ngx_addon_dir/ngx_mysql.h"
#CORE_LIBS="$CORE_LIBS -lmd"

USE_SHA1=YES

NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_mysql.c"
NGX_ADDON_SRCS="$NGX_ADDON_SRCS $ngx_addon_dir/ngx_http_mysql_test.c"