Adding a dash if missing the path component does not make sense.

Related bug:	#1584

child process during startup.

Fixes #1407

This prevents SLT_ReqAcct log records with 0 as VXID.

non-fatal.

Fixes: #1414

Fixes: #1466

Fixes #1580

Fixes #1583

Fixes a regression from 33e6fe71

Fixes #1585

Also hide a might-be change until it's really implemented.

Thanks to dridi.boukelmoune@zenika.com for reporting.

This should bring us closer to the exit codes now documented in
varnishd.rst

Fixes #1572 for tools

This should bring us closer to the exit codes now documented in
varnishd.rst

Fixes #1572 for varnishd

Thanks to fgs for reviewing

testcases at the same time.

Spotted by:	UPLEX

After discussion with phk: exit(4) is a real exception, we should abort() whenever
possible.

The error codes patch is still to be committed.

Section 4.2 (Messages Headers) of RFC2616 defines field (header) name as case
insensitive, but the field (header) value/content may be case-sensitive.

http_GetHdrToken looks up a token in a header value and the rfc does not say
explicitly if tokens are to be compared with or without respect to case.

But all examples and specific statements regarding tokens follow the rule
that unquoted tokens are to be matched case-insensitively and quoted tokens
case-sensitively.

Fixes #1582

(This doesn't _quite_ close the race, but at least test c00034 is
much more stable now.)