Create a new template for generating a pod unit file. Eventually, this
allows for treating and extending pod and container generation
seprately.
The `--new` flag now also works on pods.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
Refactor the systemd-unit generation code and move all the logic into
`pkg/systemd/generate`. The code was already hard to maintain but I
found it impossible to wire the `--new` logic for pods in all the chaos.
The code refactoring in this commit will make maintaining the code
easier and should make it easier to extend as well. Further changes and
refactorings may still be needed but they will easier.
Signed-off-by: Valentin Rothberg <rothberg@redhat.com>
