build/create-image.sh: fix build for grub2 under RHEL7/CentOS7
build/create-image.sh: fix build for grub2 under RHEL7/CentOS7

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