serf_get: Fix counting of completed requests.
serf_get: Fix counting of completed requests.

* test/serf_get.c
  (handler_baton_t): Rename requests_outstanding to completed_requests.
  (handle_response): Increment completed_requests when request fully read.
  (setup_request): Remove requests_outstanding usage.
  (main): Exit when completed_requests equals to number of submitted 
   requests.

lazysoez/serf,KyleSanderson/serf,zhupan/serf,lazysoez/serf,yesoce/serf,google-code-export/serf,zhengcq315/serf,alex1818/serf,x-clone/serf,pengdu/serf,zhengcq315/serf,zhupan/serf,soufianeEL/serf,x-clone/serf,KyleSanderson/serf,SirJson/serf,yesoce/serf,SirJson/serf,alex1818/serf,KyleSanderson/serf,zhupan/serf,alex1818/serf,stoneCC/serf,lazysoez/serf,SirJson/serf,soufianeEL/serf,lazysoez/serf,stoneCC/serf,pengdu/serf,google-code-export/serf,stoneCC/serf,alex1818/serf,stoneCC/serf,x-clone/serf,google-code-export/serf,zhengcq315/serf,google-code-export/serf,SirJson/serf,KyleSanderson/serf,zhupan/serf,x-clone/serf,soufianeEL/serf,yesoce/serf,pengdu/serf,pengdu/serf,yesoce/serf,zhengcq315/serf,soufianeEL/serf