Fix the dhcp clean up for Ubuntu 12.04 or newer's postinstall.sh

For more info, please see the Launchpad issue at https://bugs.launchpad.net/ubuntu/+source/isc-dhcp/+bug/910108
adding an option to skip iso transfer
DEBIAN 6.0.5: Change the mirror server to ftp.us.debian.org

This makes the "mirror does not support this release" error go away.
DEBIAN 6.0.6: Make the VM wor better on machines without VT extensions
add SLES-11-SP2-DVD-x86_64-GM template
Fixed the markup for the non-vagrant usage
Merge pull request #480 from ankurcha/patch-1

Fixed the markup for the non-vagrant usage
Merge pull request #457 from eladroz/master

SLES 11SP2 Template
Merge pull request #456 from edgester/debian-squeeze-fixes

Debian squeeze fixes
Fixes typo
Merge pull request #482 from editor/master

Fixes small typo in Readme.md
Added templates for CentOS 5.9 (DVD).
Added templates for CentOS 5.9 (netboot).
Accidentally deleted shutdown command.
Use thread when typing boot sequence

In some cases typing the delay in finishing the console_type method is longer than the boot process of the virtual machine. In these cases the kickstart server will only be started after the VM searches for it, which usually results in an error.

Putting the console_type method into a thread solves this problem,  as it ensures that the kickstart server starts to wait for connections before the typing is finished.

The issue has been observed with the KVM provider, but may also occur for other providers. The fix will work for all providers and does not change the current behavior.
Merge pull request #488 from ffeldhaus/build-thread

Use thread when typing boot sequence
jedi4ever/veewee#490 allocate wincp http port just before use
Cleanup rescued exceptions list; Errno::ENETUNREACH is duplicated
Merge pull request #492 from juliandunn/master

clean up exceptions list
Merge pull request #491 from hh/issue-490

jedi4ever/veewee#490 allocate wincp http port just before use