Add new test for serf_config_remove_value.
Add new test for serf_config_remove_value.

* test/test_internal.c
  (test_config_store_remove_objects): New test.
  (test_internal): Run the new test.

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