Revert "Check for the full stack based path first."
Revert "Check for the full stack based path first."

This reverts commit 80a1987a5f7f3dc28424256dbb2741ed64037c0f. By
checking the full-stack path first, we run the risk of loading the
incorrect cakephp-plugins.php file as we're reaching outside of the
application root directory.

Refs #8055

jeffblack360/cakephp,justinyost/cakephp,jeffblack360/cakephp,cakephp/cakephp,tenkoma/cakephp,mvdriel/cakephp,cakephp-fr/cakephp,petteyg/cakephp,dakota/cakephp,garethellis36/cakephp,CakeDC/cakephp,timhoeppner/cakephp,CakeDC/cakephp,berrygoudswaard/cakephp,thinkingmedia/cakephp,ADmad/cakephp,bravo-kernel/cakephp,cakephp-fr/cakephp,mvdriel/cakephp,mvdriel/cakephp,davidyell/cakephp,ADmad/cakephp,Phillaf/cakephp,Phillaf/cakephp,CakeDC/cakephp,dakota/cakephp,tgr0ss/cakephp,mvdriel/cakephp,tgr0ss/cakephp,ionas/cakephp,thinkingmedia/cakephp,thinkingmedia/cakephp,HavokInspiration/cakephp,timhoeppner/cakephp,garethellis36/cakephp,ndm2/cakephp,gmponos/cakephp,cakephp/cakephp,gmponos/cakephp,Phillaf/cakephp,ADmad/cakephp,elboletaire/cakephp,tgr0ss/cakephp,ndm2/cakephp,ndm2/cakephp,justinyost/cakephp,dakota/cakephp,dakota/cakephp,CVO-Technologies/cakephp,michaelze/cakephp,michaelze/cakephp,petteyg/cakephp,petteyg/cakephp,ADmad/cakephp,elboletaire/cakephp,CVO-Technologies/cakephp,jeffblack360/cakephp,berrygoudswaard/cakephp,tenkoma/cakephp,bravo-kernel/cakephp,justinyost/cakephp,nrother/cakephp,tenkoma/cakephp,berrygoudswaard/cakephp,nrother/cakephp,ndm2/cakephp,ionas/cakephp,CakeDC/cakephp,davidyell/cakephp,garethellis36/cakephp,nrother/cakephp,timhoeppner/cakephp,davidyell/cakephp,michaelze/cakephp,bravo-kernel/cakephp,CVO-Technologies/cakephp,garethellis36/cakephp,cakephp/cakephp,ionas/cakephp,HavokInspiration/cakephp,gmponos/cakephp,cakephp-fr/cakephp,petteyg/cakephp,cakephp/cakephp,elboletaire/cakephp,tenkoma/cakephp,HavokInspiration/cakephp