FIX: Kernel Download on SLC6 x64

The previous fix figured out the version of the installed kernel and downloaded the associated AUFS version. However, the current SLC6 x64 image has two kernels installed and boots the older one. Therefore the script tried to install an older kernel than the newest installed one. Meh!

Futhermore I missed a `--no-check--certificate` for a `wget` and beautified the output of `wget` a bit. ;-)

**Note:** Sorry for the extensive Pull Request driven debugging...