Remove aug_exists - it does not exist anymore
Remove aug_exists - it does not exist anymore

hercules-team/augeas-do-not-use,ptoscano/augeas,pevalme/augeas,camptocamp/augeas,camptocamp/augeas,GeoffWilliams/augeas,hercules-team/augeas,mlichvar/augeas,raphink/augeas,domcleal/augeas,mlichvar/augeas,lutter/augeas,mlichvar/augeas,GeoffWilliams/augeas,manandbytes/augeas,jtopjian/augeas,manandbytes/augeas,domcleal/augeas,kunkku/augeas,MikaelSmith/augeas,mchf/augeas,pevalme/augeas,raphink/augeas,dafugg/augeas,domcleal/augeas,kumy/augeas,jjlin/augeas,ptoscano/augeas,jasperla/augeas,kumy/augeas,kumy/augeas,hercules-team/augeas,camptocamp/augeas,bkearney/augeas,ptoscano/augeas,pevalme/augeas,kumy/augeas,mchf/augeas,camptocamp/augeas,jasperla/augeas,bkearney/augeas,hercules-team/augeas-do-not-use,lutter/augeas,bkearney/augeas,jjlin/augeas,dafugg/augeas,bkearney/augeas,kunkku/augeas,dafugg/augeas,jtopjian/augeas,hercules-team/augeas-do-not-use,kunkku/augeas,lutter/augeas,MikaelSmith/augeas,jjlin/augeas