bug#22039: [PATCH] 'guix system reconfigure' must start/restart/stop services

[Carlo Zancanaro]

When the next release of the Shepherd is made (including commit 
9ec5c0000e9a45441417a6ee4138cdcbf1b1f2b2) we should have the 
capability to resolve this ticket.

Attached is my proposed patch from the Guix side. I have tested it 
on my machine by grafting the Shepherd with the appropriate patch 
and it seems to work as expected.

I tested it by changing the substitute-urls in my guix-daemon 
configuration. The output of `ps aux | grep guix-daemon` after 
`guix system reconfigure` showed the substitute-urls were 
unchanged. After `herd restart guix-daemon` the updated 
substitute-urls appeared in `ps aux | grep guix-daemon`. I did not 
need to reboot my system.

One possible improvement would be to print out the services that 
need to be restarted to be upgraded.

0001-gnu-services-Load-all-services-on-reconfigure-not-ju.patch
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