Adding 4.13 and 4.14 to CentOS 7
removing CentOS 6 from spec

adding CentOS 8

Change default:
to 4.12 for CentOS 7
to 4.10 for CentOS 6

Fix, 4.12 is only available el7 repos

4.6 only available in el6 now
Adding Xen 4.12 repo

Change default to Xen 4.8
Add Xen 4.10 repo

Add 'dependencies' repo, to selectively enable packages from epel

Add repository for 4.8. Leave default at 4.6 for now.

Point centos-release-xen to Xen 4.6 for CentOS 6

Break out version-specific packages for those who don\'t want to update

Fix bug \in grub-bootxen.sh that caused no initrd line to be installed

buildlogs (centos-virt-xen-testing) packages are not signed

Removed CBS repositories
Moved C6 repos to Virt SIG layout
Include all files so we can build the same srpm on any arch

Add dependency on Virt SIG gpg key
Shifted /etc/sysconfig/xen-kernel to xen package

Configure for aarch64 systems

Change virt6 repos to new format (virt6-xen-{44,46}-{testing,candidate})