beresp.cacheable is gone.

Essentially identical to patch by Martin

move n_object accounting responsibility to stevedores.

Fix n_object accounting detail in persistent.

in preparation for moving exp from obj to objcore

clearly isn't going to be a much used public interface.

we know what we're doing.

Reserving and returning space from wrk->aws is OK.

advantage from having two mechanisms.

or an string-insertion-sort feels right for me.

Using reserved workspace to tracking the params and qsort(3) to sort them
solves both problems.

As discussed on the latest VDD.

While here unify check.

This allows varnishlog and the other tools to group it automatically
with the client request.

Fixes #1269

This makes varnishncsa continue to log if the end timestamp should be missing for some reason.

Please test this ASAP (before 4.0.1)

Fixes: 	#1509

Fixes	#1524

used on requests.

Fixes	#1530