restart according to rolling upgrade instructions added

[smirta]

This will add a switch to restart a cluster according to instructions noted in Rolling Upgrade Procedure for upgrading a single HA cluster.

Flow in ansible:

1. Identify if host is a leader
2. If not, restart it
3. Wait until it is available again
4. restart leader

I'm by no means an Ansible expert, I hope this makes sense and this PR is acceptable. As far as I can see it works as expected.

[FalcoSuessgott]

thanks for the PR! Looks great, I will try to fix that CI very soon so you can continue