merged 5.0 (traditional vserver-based) and 5.1 (aka lxc_devel)

merged 5.0 (traditional vserver-based) and 5.1 (aka lxc_devel)
now retrieves GetNodeFlavour as part of GetNodeDetails
and stores result as global vars['node_flavour']
this one now is expected to include the 'virt' tag
as either 'vs' or 'lxc' and act accordingly
STILL MISSING
fsck under btrfs, i.e.
* turn off periodic fsck in InstallPartitionDisk, and
* explicitly run fsck in ValidateNodeInstall
ALSO
the MakeInitrd and WriteModprobeConfig steps are turned off with lxc