Removed some more unnecessary firmware packages

I've used ```package-cleanup --leaves --all``` and ```repoquery -l``` to identify some more unused firmware packages.

If size matters, the following packages could be deleted as well. It depends on your definition of „JeOS“. 
I prefer to remove as much as possible and provision the base box with Chef afterwards. 
On the one hand this approach leads to a least common multiple for all operating systems - on the other hand it requires provisioning real low-level stuff. 

```
-parted
-postfix
-NetworkManager-tui
-firewalld
-btrfs-progs
-microcode_ctl
-tuned
-selinux-policy-targeted
-rsyslog
-lvm2
```