Add variables for /root and /var, and change the defaults to be larger

Udate the preseed template and define to:
a) update the default sizes:
  /root: 32GB
  /var: 128GB
b) allow for upstream parameterization
 in the cobbler-node.pp file, you can now add:
  $root_part_size => "65536",
  $var_part_size => "1048576",
Which would make for a 64GB root and a 1TB /var partition
Merge remote-tracking branch 'upstream/grizzly' into grizzly
Update preseed to use disk for /var and larger /

Remove the "hack" logical volume and make /var grow to
consume any free disk space.  /root is also made larger by
default.

These are still tweakable via:

$root_part_size
$var_part_size

in cobbler::ubuntu::preseed
Remove stale line that runs lvremove on /tmp/hack.
Merge pull request #1 from markvoelker/grizzly

Remove stale line that runs lvremove on /tmp/hack.
Merge remote-tracking branch 'upstream/grizzly' into grizzly

Conflicts:
	templates/preseed.erb
Update ubuntu preseed to include disk variables

expert_disk = true
  false uses atomic "all in /" disk config
enable_var = true
  false doesn't create separate /var
var_part_size = size-in-Kb
root_part_size = size-in-Kb
enable_hack = true
  false doesn't create hack, so last partition takes all free space
Rename enable_hack to enable_vol_space
Swap order of swap and root in preseed

Enables root only config
Fix no_default_route preseed command
Merge pull request #46 from robertstarmer/disk_config

Update ubuntu preseed to include disk variables #1195824