Change SIGHUP handling depending on whether we're running in daemon mode
or foreground. The former will continue rotating the logs, the latter
will abort the loop and die gracefully.

Fixes #1794.

Fixes #1809.

Found by ingvar while packaging 4.1.0.

Use `python' as with the other Python scripts.

makes work for it.  Have it sleep as long as possible, rather
than hot-polling for work to do.

Amazingly JEMALLOC didn't spot this one.

from the data structure we use to store and operate on the ban (ban).

on the ban lurker not starting.

Move cache_hash's access to bans into cache_priv.h

No functional changes.

This reverts commit ed6dca6b.
abandon in vcl_backend_* will take us to vcl_synth{}.

make somewhat more predictable.

Disable syslogging when we're running under varnishtest.

panic_string to syslog until we have washed it.

Previously it said `vcl_all' which doesn't exist.  Minor cosmetics while
I'm here.

Partially addresses #1795.

This was missing on my previous commit.

Disabled by default. Prompted by Rafael Zalamena
(rafaelfz at taghos dot com dot br) on varnish-dev.

From minusf via github with minor tweaks.

For those cases where you want to send a different reason
message, but use the normal status code.

Noticed by Kacper when doing 301/302 in vcl_synth().