Simplify csrf token handling in test helpers.
Simplify csrf token handling in test helpers.

ndm2/cakephp,ADmad/cakephp,CakeDC/cakephp,ndm2/cakephp,CakeDC/cakephp,ADmad/cakephp,cakephp/cakephp,CakeDC/cakephp,ndm2/cakephp,ndm2/cakephp,CakeDC/cakephp,cakephp/cakephp,cakephp/cakephp,ADmad/cakephp,cakephp/cakephp,ADmad/cakephp