Fix and simplify headers bucket test.
Fix and simplify headers bucket test.

* test/test_buckets.c
  (test_header_buckets): Use read_and_check_bucket() to test bucket 
   output. Remove extra CRLF from expected output.

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