Issue 596: TypeError running cobbler check

This is a simple failure to write the arguments
to a format string as a tuple.
Make -S flag works on debian/ubuntu
Set hostname and domain name if -S option used
Add distro signature and bootcfg template for VMware ESXi 5.5
Merge pull request #613 from Authority1980/master

Add distro signature and bootcfg template for VMware ESXi 5.5
Merge pull request #610 from sample/master

Added support for koan option -S on Debian/Ubuntu
Merge pull request #597 from jcsp/master

Issue 596: TypeError running cobbler check