and instead (ab)used the obj.* set.

This allowed, amongst other things, the headers of cached objects
to be munged by subsequent cache-hits.

This was just as bad an idea as it sounds.

The downside was, that we had to reserve object workspace for the
potentially created headers, and this really bites, memory wise,
if your content is many small objects.

This commit allows, and sets obj_workspace to zero, allocating only
as much space as is necessary for the actual headers after vcl_fetch()
has returned.

The downside is, without extra workspace, you can no longer change
the content of obj.* string variables after the vcl_fetch() which
instantiated the object.

For now we still allow the obj_workspace to be set to reserve such
space, but in all likelyhood, this ability will disappear in the
future.





git-svn-id: http://www.varnish-cache.org/svn/trunk@4224 d4fa192b-c00b-0410-8231-f00ffab90ce4