Mostly an attempt at pointing people that send pull requests on Github
in the right direction.

Move showing of debug counters from 'h' key to 'd' inside a running
varnishstat.

Fixes	#1449

Make sure we do not send a regular "end-chunk" to the
client if the streaming fetch fails.

to reduce code duplication a little bit.

on IMS fetch.

This should possibly be an official VSL record ?

This will be revisited post 4.0. Reorder while I'm here.

Only varnishreplay is left now.

This matches the rest of the code.

over a bogo-object.

This means that vcl_error{} looses access to obj.* variables, but
gains access to resp.* vaiables instead.

A couple of now obsolute test-cases retired.

	synthetic ( STRING_LIST ) ;

This eliminates the need for the SMS stevedore.

to not confuse VCL by "backend" suddenly changing gzip status, but do
unconditionally smash it in there afterwards, no matter what VCL
does, so it will be correct relative to the existing body.

for consistency.

Accessing bereq.first_byte_timeout and bereq.between_bytes_timeout
in vcl_pipe makes no sense so disallow it.

Fixes: #1435