[bug#32408] [PATCH shepherd] Allow replacement of services

[Carlo Zancanaro]

This is a relatively simple patch adding a replacement slot to 
services in the Shepherd. When stopping a service, the replacement 
slot is checked and, if it has a value, is used to upgrade the 
current service.

I've chosen to modify the existing service, rather than creating a 
new one, but that was mostly because it was easier for me to 
implement quickly, and I didn't have a huge amount of time.

I'm hopeful that this, or something like it, can be used by GuixSD 
to allow people to restart services after reconfiguring without 
rebooting (or remembering to stop, reconfigure, start).

Carlo

0001-service-Add-a-replacement-slot-for-delayed-service-r.patch
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