support external management / push of configuration files

To better support container systems, we should allow optional disabling of the pm1 node automatically synchronizing configuration files to the other nodes. This would allow an external orchestration engine to perform this management instead. This should definitely not be done by default but it should be easy to disable via a config setting.

Note that distribution of dbrm metadata is not in scope, this is purely focussed on enabling an external system to setup and scale out nodes.