Change Chef directories

Since Traivs is complaining with:

[2013-12-27T08:34:13+00:00] INFO: Forking chef instance to converge...
[2013-12-27T08:34:13+00:00] DEBUG: Fork successful. Waiting for new chef
pid: 3956
[2013-12-27T08:34:13+00:00] DEBUG: Forked instance now converging
[2013-12-27T08:34:13+00:00] DEBUG: Creating directory /var/chef/cache
[2013-12-27T08:34:13+00:00] ERROR: Permission denied - /var/chef/cache