Upgrade: Restart Policy for systemd services

[MatthiasScholz]

Summary

To support rolling upgrades of the cluster orchestration system the restart policy for the nomad and consul services needs to be enhanced.

Expectation

In case of a normal shutdown of the application the service should not restart automatically.
In case of an abnormal shutdown the application the service should be restarted automatically by systemd.

Hint

• Configuration systemd: Restart=

[MatthiasScholz]

File to change https://github.com/MatthiasScholz/cos/blob/master/modules/ami2/install-nomad/nomad.service

[MatthiasScholz]

Solved with PR #87.