[PATCH 09/13] Add a signal_close callback method to stevedores, which can be used to signal background threads to stop in preparation for the coming close callback.

[Martin Blix Grydeland]

Review comments:

In either case, it is silly that we close the silos serially, you
> should add a "signal_close()" method to stevedore, and call
> any which is non-NULL as the first thing in STV_close(), so that
> we can sed the SC_STOP on all silos before we wait for the first
> one to do so.


Implemented this

-- 
Martin Blix Grydeland
Varnish Software AS
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