Add the xfsprogs package

[afbjorklund]

Note that only e2fsprogs is part of the template, which means that mkfs.xfs is missing...

https://github.com/minishift/minishift-fedora-iso/blob/master/fedora.template#L34

--- a/fedora.template
+++ b/fedora.template
@@ -34,6 +34,7 @@
 buildah
 dracut
 e2fsprogs
+xfsprogs
 efibootmgr
 grub2
 grub2-efi

Think XFS was default on CentOS, but is not on Fedora (only the Server variant) ?

https://docs.fedoraproject.org/en-US/fedora/f28/install-guide/install/Installing_Using_Anaconda/#sect-installation-gui-manual-partitioning-filesystems