This should resolve [#2296](https://github.com/spantaleev/matrix-docker-ansible-deploy/issues/2296) by fixing the noted issue.

This also paves the way for in the future working on D4A mode but that would require a rework to how these variables are done.

This is an attempt at optimizing service startup.

The effect is most pronounced when many services are restarted one by one.
The systemd service manager role sometimes does this - for example when `just install-service synapse` runs.
In such cases, a 5-second delay for each Synapse worker service
(or other bridge/bot service that waits on the homeserver) quickly adds up to a lot.

When services are all stopped fully and then started, the effect is not so pronounced, because
`matrix-synapse.service` starts first and pulls all worker services (defined as `Wants=` for it).
Later on, when the systemd service manager role "starts" these worker services, they're started already.
Even if they had a 5-second wait each, it would have happened in parallel.

Patch contributed by JulianF.

main.yml is not included due to that its changed separately.