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
BUGFIX: return 1 when no MAC is passed to mac_exists()

If an interface doesn't have a MAC, mac_exists() is called with an
empty string that returns a list of all interfaces names.  Instead,
return 1 from the function so that the "network" line is not
generated.
Minor ordering fix to Authors. Fixes #608
Merge pull request #619 from jmaas/bug-608

Minor ordering fix to Authors. Fixes #608
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
We force the use of https; but dont require the mod_ssl pacakge.
Merge pull request #620 from jmaas/master

We force the use of https; but dont require the mod_ssl pacakge.
Remove unused Yaml imports.
Merge pull request #621 from jmaas/master

Remove unused Yaml imports.
Merge pull request #615 from aronparsons/skip-nic-with-no-mac

BUGFIX: return 1 when no MAC is passed to mac_exists()