Added grub2-common to centos8.tmpl
If "wwmkchroot centos-8 $CHROOT" doesn't install grub2-common package,
"yum -y --installroot=$CHROOT install kernel" doesn't create
/boot/vmlinuz and /boot/initramfs which files "wwbootstrap" requires.
zlib tar less gzip which util-linux openssh-clients
openssh-server dhclient pciutils vim-minimal shadow-utils
- strace cronie crontabs cpio wget redhat-release"
-+ strace cronie crontabs cpio wget redhat-release hostname"
++ strace cronie crontabs cpio wget redhat-release hostname grub2-common"
# vim:filetype=sh:syntax=sh:expandtab:ts=4:sw=4:
