create-image.sh: fix grub.cfg generated under Ubuntu 12.04
create-image.sh: fix grub.cfg generated under Ubuntu 12.04

lebauce/edeploy,enovance/edeploy,redhat-cip/edeploy,redhat-cip/edeploy,enovance/edeploy,lebauce/edeploy,redhat-cip/edeploy,lebauce/edeploy,lebauce/edeploy,enovance/edeploy,enovance/edeploy,redhat-cip/edeploy