Some minor issues on FABRIC tester

[swelborn]

firewall-cmd not found on default_ubuntu_22

In the firewall section of the fabric tests here:

https://github.com/JeffersonLab/E2SAR/blob/af8e7a798b9689b46bf4d98fffc42b11f78a717d/scripts/notebooks/EJFAT/E2SAR-fabric-lb-tester.ipynb

It appears firewalld is not installed in the images. When I add the following command:

            f'sudo apt update && sudo apt install -y firewalld && sudo systemctl start firewalld && sudo systemctl status firewalld',

to the command list, it appears to work.

(as an aside, it may be useful to chain together commands like this with && to speed things up, but not that important...).

vm_key_location:

Should be:

github_key = '/home/fabric/work/fabric_config/github_ecdsa'

instead of

github_key = '/home/fabric/work/fabric_confi/github_ecdsa'