Patch review for fix to #947 (assert on SIGHUP to varnishncsa)

[Martin Blix Grydeland]

This bug is caused by an assert when usleep is interrupted by signal
delivery in vsl.c (libvarnishapi). Some tools expect to receive signals
(e.g. varnishncsa with -w option), so this has to be addressed. Attached
patch relaxes the assert to not trigger on signal interrupt. Any comments
appreciated.

Regards,
Martin Blix Grydeland

-- 
Martin Blix Grydeland
Varnish Software AS
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