Add https support to isolink

Allow download from https:// URIs
no, really, returning super here doesn't work

I've tested this now a number of times and in a number of ways, it does
not work to return super here in this munge, I'm always getting this error:

```
Error: Failed to apply catalog: Parameter arch failed on Cobblerdistro[ubuntu-12.04.3-x86_64]: Munging failed for value "x86_64" in class arch: implicit argument passing of super from method defined by define_method() is not supported. Specify all arguments explicitly.
```

This patch, fixes the issue.
Merged in igalic/puppet-cobbler (pull request #11)

OK, no problem. Thank you for wasting time on this one :)
make mounts more resillient towards failures
properly support --breed and --os-version

make it possible to (correctly) set (or change) --breed and --os-version
give ks_meta a more terse but more clear assignment
Merged in igalic/puppet-cobbler (pull request #13)

properly support --breed and --os-version
Merged in igalic/puppet-cobbler (pull request #12)

give ks_meta a more terse but more clear assignment