Revert "Revert "Restore $uri variable in subrequests""
Revert "Revert "Restore $uri variable in subrequests""

This reverts commit b6b36b0ebdc0ed375570ecf44c223b2ca8b5bebc.

vkholodkov/nginx-eval-module,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx,yeahdongcn/SEnginx