Fixes: #1024

Tighten it up with use of semaphores and collapse s1/s2/s3 using
"accept" keyword.

The intent is that they should be mined and dumped into the
documentation.

Feel free to add (or send patches with descriptions, preferably
only one line or paragraph for each.

Conflicts:

	bin/varnishd/cache_wrk.c
	include/vsc_fields.h

Fixes: #912

Solaris puts the ncurses header in /usr/include/ncurses, and we need
that to compile with -Werror.

Fixes: #889

It used to be that we'd call http processing on a filedescriptor and
then that was that.  Then we added keywords to do new accepts in the
server and suddenly the calling code closes a wrong filedesc which
belongs to somebody else and things get really inconvenient fast.

This made all test-cases which use the "accept" server directive flakey.

test failures seems to be timeouts on stressed machines.

Teport timeouts more clearly.

two separate timestamps just happen to be the same, just make them
the same.

the same address again, even with hinting.

this should solve issues where the c2-v1 connection times out before
it ever got used.

Apache (and nginx) uses 8k, so use the same default size to avoid
people being surprised by more 413 responses than necessary.

Fixes: #1016

Thanks to cleberjsantos for initial patch which this is based on.

Fixes: #976

are no lingering bits.

Convert an assert to a failure.

Based on code from:	DocWilco