Fix the isolated environment spec on OS X
Fix the isolated environment spec on OS X

The reason this spec was failing is that on OS X the temp directory is
actually something like this:

/var/folders/bg/8sxn6p0j5kv0j1z__3hwz5nm0000gn/T/

However, /var is not an actual folder, but a symlink to /private/var and
that causes the check for root_level in ConfigLoader.dirs_to_search() to
fail and the ascend to continue.
palkan/rubocop,sachin21/rubocop,brayzen/rubocop,stbenjam/rubocop,byroot/rubocop,dennisfaust/rubocop,petehamilton/rubocop,savef/rubocop,bankair/rubocop,namack/rubocop,sue445/rubocop,meganemura/rubocop,sch1zo/rubocop,janusnic/rubocop,tansaku/rubocop,deivid-rodriguez/rubocop,sue445/rubocop,tejasbubane/rubocop,pocke/rubocop,haziqhafizuddin/rubocop,MeetMe/rubocop,sinsoku/rubocop,panthomakos/rubocop,deivid-rodriguez/rubocop,bglusman/rubocop,fastly/rubocop,hanumakanthvvn/rubocop,petehamilton/rubocop,akihiro17/rubocop,rrosenblum/rubocop,dreyks/rubocop,lumeet/rubocop,apiology/rubocop,imtayadeway/rubocop,ypresto/rubocop,martinciu/rubocop,Likita/rubocop,sue445/rubocop,martinciu/rubocop,Likita/rubocop,rrosenblum/rubocop,maxjacobson/rubocop,sferik/rubocop,bquorning/rubocop,edmz/rubocop,bigcommerce-labs/rubocop,imtayadeway/rubocop,dennisfaust/rubocop,backus/rubocop,kjavier/rubocop,volkert/rubocop,Koronen/rubocop,tranvictor/rubocop,iGEL/rubocop,irfanah/rubocop,dmnd/rubocop,lumeet/rubocop,bbatsov/rubocop,sideci-sample/sideci-sample-rubocop,josiahsoh/rubocop,mikegee/rubocop,bankair/rubocop,b-t-g/rubocop,tdeo/rubocop,caseywebdev/rubocop,unmanbearpig/rubocop,rtlechow/rubocop,byroot/rubocop,redbricksystems/rubocop,smakagon/rubocop,maxjacobson/rubocop,lencioni/rubocop,tejasbubane/rubocop,MGerrior/rubocop,panthomakos/rubocop,brunoocasali/rubocop,jmks/rubocop,tansaku/rubocop,matugm/rubocop,deepj/rubocop,vergenzt/rubocop,fphilipe/rubocop,legendetm/rubocop,vassilevsky/rubocop,haziqhafizuddin/rubocop,kjavier/rubocop,jmks/rubocop,Koronen/rubocop,backus/rubocop,maxjacobson/rubocop,plribeiro3000/rubocop,fphilipe/rubocop,syndbg/rubocop,dblock/rubocop,irfanah/rubocop,mikegee/rubocop,NobodysNightmare/rubocop,akihiro17/rubocop,mrfoto/rubocop,hamhut1066/rubocop,lucasuyezu/rubocop,apiology/rubocop,kdmsnr/rubocop,panthomakos/rubocop,mlitwiniuk/rubocop,urbanautomaton/rubocop,crazydog115/rubocop,smakagon/rubocop,zhwcoder/rubocop,palkan/rubocop,mlitwiniuk/rubocop,net-engine/rubocop,legendetm/rubocop,jfelchner/rubocop,Drenmi/rubocop,MeetMe/rubocop,hkraji/rubocop,namack/rubocop,alexcstark/rubocop,jfelchner/rubocop,benlovell/rubocop,seanhussey/rubocop,dmnd/rubocop,sachin21/rubocop,tranvictor/rubocop,sch1zo/rubocop,ilansh/rubocop,miquella/rubocop,deepj/rubocop,scottmatthewman/rubocop,bquorning/rubocop,unmanbearpig/rubocop,karreiro/rubocop,jonas054/rubocop,mrb/rubocop,bglusman/rubocop,vassilevsky/rubocop,lencioni/rubocop,zBMNForks/rubocop,kdmsnr/rubocop,brayzen/rubocop,tdeo/rubocop,segiddins/rubocop,janusnic/rubocop,Talentee/rubocop,tdeo/rubocop,scottmatthewman/rubocop,karreiro/rubocop,miquella/rubocop,meganemura/rubocop,jmks/rubocop,agrimm/rubocop,dreyks/rubocop,caseywebdev/rubocop,mrfoto/rubocop,agrimm/rubocop,mclark/rubocop,zvkemp/rubocop,crazydog115/rubocop,dblock/rubocop,net-engine/rubocop,jonas054/rubocop,akihiro17/rubocop,Talentee/rubocop,sinsoku/rubocop,melch/rubocop,alexcstark/rubocop,lucasuyezu/rubocop,redbricksystems/rubocop,zhwcoder/rubocop,linchus/rubocop,stbenjam/rubocop,volkert/rubocop,segiddins/rubocop,matugm/rubocop,seanhussey/rubocop,edmz/rubocop,syndbg/rubocop,iGEL/rubocop,mclark/rubocop,petehamilton/rubocop,rrosenblum/rubocop,jfelchner/rubocop,NobodysNightmare/rubocop,ypresto/rubocop,MGerrior/rubocop,bbatsov/rubocop,b-t-g/rubocop,brunoocasali/rubocop,alexdowad/rubocop,josiahsoh/rubocop,pocke/rubocop,meganemura/rubocop,zBMNForks/rubocop,plribeiro3000/rubocop,urbanautomaton/rubocop,mrb/rubocop,bquorning/rubocop,benlovell/rubocop,palkan/rubocop,rtlechow/rubocop,deivid-rodriguez/rubocop,Drenmi/rubocop,linchus/rubocop,hanumakanthvvn/rubocop,ilansh/rubocop,hkraji/rubocop,savef/rubocop,hamhut1066/rubocop,vergenzt/rubocop,vergenzt/rubocop,melch/rubocop,fastly/rubocop,tejasbubane/rubocop,alexdowad/rubocop,sferik/rubocop,zvkemp/rubocop,mikegee/rubocop