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d/rules: Restart qemu-guest-agent.service after upgrade

Sergio Durigan Junior requested to merge sergiodj/qemu:start-qemu-guest-agent-install into master

Launchpad bug: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/2028124

I think qemu-guest-agent.service should be automatically started after installation. I tried doing some archaeology and finding the reason why we're passing --no-start to dh_installsystemd, but couldn't really find the reasoning.

As can be seen in the bug linked above, there seems to be a change of behaviour that was (mistakenly?) introduced in debhelper 12 and that led to the following scenario:

On Focal

  • Install qemu-guest-agent, start the service.
  • Reinstall the package. You will notice that the service is brought back after the installation.

On Jammy

  • Install qemu-guest-agent, start the service.
  • Reinstall the package. You will notice that the service is NOT brought back after the installation.

I tested this proposed change and verified that it works fine in a Debian VM.

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