added template SLES 11 SP3 x64_64

Hi,

I added a new template for SUSE Linux Enterprise Server 11 SP3, 64bit.

The Template is based on existing work for SLES11SP2 with following changes:
* puppet will be installed as RPM via the Zypper Repo http://download.opensuse.org/repositories/systemsmanagement:/puppet/
* The packages rubygem-ruby-augeas and rubygemt-ruby-shadow are installed by default
* shutdown_cmd set to /sbin/poweroff in definition.rb

Greetings,

XaLopp