Only restart servers if/when applying updates

[cosmincc]

Right now the plex servers are shut down even when running in dry-run.
I believe this can be optimized and interrupt plex servers only if applying updates to the DB.

[Fmstrat]

If you're looking for this, you should try https://github.com/Fmstrat/plex-cluster instead. 😉

[Fmstrat]

Actually, reopening as this is still a valid comment.