Don't restart immediately when associating a volume

[punkstarman]

Associating a volume to an application requires a restart to be effective.

However, when adding several volumes at a time, the application is restarted each time, even though one restart is sufficient.

It is preferable to delay restarting to a time of the user's choosing.

The same goes for other settings that require restarting, so more issues will follow.

[zepouet]

Thanks @punkstarman for the deffered solution :)