... for those cases which can easily be changed (most of them).

This avoids issues with failing tests when bad_ip is actually reachable
via tcp on the respective port, as seen for example with b00068.vtc

by properly cleaning up the busyobj

Also move the relevant code from cache_vrt.c to cache_fetch.c

As we fini the director during cleanup, we now also need to handle the
backend connection gone missing in vbf_stp_fetch(). The hypothetical
alternative would be to not fini the director, but I believe this is not
safe in case it also used some workspace.

Fixes #3009

in particular because it may live on the workspace.

Required for #3009

imples the following changes:

* VDI_Finish() is now always conditional on bo->director_state !=
  DIR_S_NULL, making it idempotent

* introduces additional calls to VFP_Close() from startfetch and
  for the filter_list / VCL_StackVFP error in vbf_stp_fetch(),
  but VFP_Close() is idempotent.

* adds VFP_Close() for VFP_Open() failure in vbf_stp_fetch() which
  I think is actually missing (for the case that some VFPs could
  get opened before the open failure)

* calls VDI_Finish() earlier in vbf_stp_fetchend: I checked the
  code and can not see any issue with this.

motivated by #3009

required for #3009

On a network where you can't trust the DNS resolver because it filters
AAAA records out v00016.vtc fails.

... to avoid future regressions of a very useful feature.

Using a gap in the test numbers.

We should avoid the word "received" in the context of response fields,
since we don't "receive" resp.* fields, only beresp. This also fixes
another inconsistency in the manual:

    RespReason - Client response response
        The HTTP response string received.

Ref #3067

@andrewwiik would you please look after the user documentation?

Ref #3067

Ref #3067

Spotted-By: Coverity Scan

When de16dba2 landed its documentation was mixed up with the other
sess_dropped counter. When sess_dropped appeared in ac393c4b the
sess_drop counter was still function, it died short after as a side
effect of ac2e067b.

WS allocation on 32bit RH

Fixes #3061

A failing write on a different stream will set h2->error, which would
cause us to panic here on the following AZ(h2->mailcall).

Fixes: #3040

To be exact: Update Via header, copyright year.

See 0c9a93f1.

- According to #3051, this does not seem too obvious to be
properly detected on Linux systems.
- Some other OSes prefer to play in their own 'backyard',
having similar feature but named differently (e.g. NetBSD)
would need addition autotools check.
- Thus proposing implementing the macro with the volatile
pointer approach rather than memory fence's, sufficient to
prevent compiler optimisations.

by providing a trivial tool to rename vmod RST references.

To @Dridi and all other ladybug-lovers: I tried, but gave up after 5'.
Maybe spatch on its own would have done the job, but sed is just so much
simpler and, IMHO, totally appropriate for the job.