vrt.h is required before vcl.h, which only contains the table
generated parts of the VRT api.

to the VDIR.

Refs 606d4856

Fixes #2433

Otherwise the VCL poker will eventually cool down the underlying VCL.

Fixes #2432

It leaks a bit outside the mgt_vcl_cooldown function but it's a trade
off to also avoid being too intrusive where go_cold is directly set.
The VCL poker now sets the state to COLD instead of indiscriminately
sending AUTO to all VCLs, only when the cooldown period has elapsed.

Refs #2432

Refs #2432

Refs #2432

Instead of instructing VUT authors to clean the generated files, make
sure they are automatically picked up. It is safe to upgrade while
still having the CLEAN_FILES rule in Makefile.am, despite "removing"
functionality (removing burden in reality).

Other improvements include a single Python detection even when building
several modules (but the underlying check is cached anyway) and a new
dependency to "nodist" sources for VMOD authors that follow the
recommendations. The "hardcoded" dependency is still present to avoid
breaking existing builds.

The file stevedore may return a buffer larger than asked for when
requesting storage. Due to lack of check for this condition, the code
to copy the synthetic error memory buffer from vcl_error would overrun
the buffer.

Patch by @shamger

Fixes: #2429

Make the subargument to -a select the overall protocol (PROXY/HTTP)
but, at least for now, not distinguish versions of these protocols.

Remove mention of http_CollectHdrSep().

So that part of the docs appear in the SYNOPSIS section.

DEFAULT is interpreted as LOWER for the HEX and URL encodings, and
is the only legal value for all other encodings.

and let that check if another function is desired.