Cleanup ovs file and restart docker on every upgrade.

In 3.3 one of our services lays down a systemd drop-in for configuring
Docker networking to use lbr0. In 3.4, this has been changed but the
file must be cleaned up manually by us.

However, after removing the file docker requires a restart. This had big
implications particularly in containerized environments where upgrade is
a very fragile series of upgrading and service restarts.

To avoid double docker restarts, and thus double service restarts in
containerized environments, this change does the following:

- Skip restart during docker upgrade, if it is required. We will restart
  on our own later.
- Skip containerized service restarts when we upgrade the services
  themselves.
- Clean shutdown of all containerized services.
- Restart Docker. (always, previously this only happened if it needed an
  upgrade)
- Ensure all containerized services are restarted.
- Restart rpm node services. (always)
- Mark node schedulable again.

At the end of this process, docker0 should be back on the system.

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