Update Terraform nomad-consul example

[ynhummel]

What does this PR do

Update the nomad-consul example to avoid errors and better usability

How

• Update Provider Version
• Avoid writing directly to /etc/needrestart/needrestart.conf, which might cause the following error:

  Can't modify reference to anonymous hash ({}) in scalar assignment at (eval 12) line 229, at EOF

• Create a virtual network and assign it with Terraform so users don't have to go to the dashboard
• Grep the ethernet to use as a VLAN link. Having it hardcoded as eno2 was causing errors when eno2 didn't exist in the file. Sometimes the second Ethernet interface would be enp1s0f1

How to Test

• Copy the files that are in the nomad-consul folder
• Run terraform init
• Fill in the necessary information in the variables.tf file
• Run terraform apply to apply the changes

References

https://www.latitude.sh/guides/nomad-consul-terraform

[esoubihe]

@ynhummel Great improvement here. Please also raise a PR updating the guide, especifically removing the need for manual VLAN and VLAN assignment.

Great work