Merge of r4470: Fix for proxy_store leaving temporary files for subrequests. Temporary files might not be removed if the "proxy_store" or "fastcgi_store" directives were used for subrequests (e.g. ssi includes) and client closed connection prematurely. Non-active subrequests are finalized out of the control of the upstream module when client closes a connection. As a result, the code to remove unfinished temporary files in ngx_http_upstream_process_request() wasn't executed. Fix is to move relevant code into ngx_http_upstream_finalize_request() which is called in all cases, either directly or via the cleanup handler.

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