Refactor CreatePostPageTest for use self.client
Refactor CreatePostPageTest for use self.client

kboard/kboard,cjh5414/kboard,darjeeling/k-board,kboard/kboard,hyesun03/k-board,guswnsxodlf/k-board,cjh5414/kboard,guswnsxodlf/k-board,guswnsxodlf/k-board,kboard/kboard,hyesun03/k-board,cjh5414/kboard,hyesun03/k-board