Add yum-autoupdate to base config

Exclude virt & qemu for VM hosts, normal file otherwise
Had to add a vm-host group so that the VM hosts can get their different
versions.
Squashme - vm hosts not fqn
Add munin-node to basic config
Squashme
Restore <Component>.</Component> to sources.xml

Packages plugin will then be able to resolve sources properly without
resorting to local yum repo config.
Squashme - msg: Add components to sources.xml
Squashme: ugly hack that makes sl repo work with Packages
Squashme

Should be squashed, along with everything else, and the original patch
named:

  "Fix Packages handling of yum repos"
Update munin-node config for second monitoring master

Could be squashed into 11c16a2d2071b591882830a9dff1c30e2fc4a6f8
Munin master config
Squashme - TCheetah comments
Squashme
Add test-pxe-vm to clients
Add /etc/hosts

We explicitly manage /etc/hosts with bcfg2 in leiu of DNS. Kickstart
only needs to provide the bare bones so a client can reach a bcfg2 server,
then every client gets the hosts file for the cluster.
Squashme
Separate localrepo.conf from apache bundle
Reverse proxy for the io nodes
Sqaushme
Squashme
squashme