bug#53580: /var/run/shepherd/socket is missing on an otherwise functional system

[Attila Lendvai]

FTR,

the issue is that when Shepherd is booting up, i.e. starting from its config 
file, it calls the start forms without guarding for any possible exceptions. 
any error propagates up beyond the loop and up until an unwind protect that 
deletes the socket.

the reason my system seemed fully functional is that my service was pretty much 
the last one to be started.

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