Feature: Support HTTP keep-alive for SOURCE connections if they give us a content-length (useful for pokes)

For legacy-global-source this adds POST to the list.
For legacy-mount-source this adds POST and DELETE to the list.
The lists are now sync.

Closes: #2366
Found while working on & See also: icecast-libshout#2303

This updates to the Mozilla Foundation's "Intermediate" list
as of the time of this commit.
The list is appended with several negative rules that we included
before.

Closes: #2356

Closes: #2355

Thanks to Julien CROUZET <contact@juliencrouzet.fr> for all the input!

See: #2017

This changes the default version of HTTP to 1.1.
The version can currently not be changed to something different.

Closes: #2057

This adds a error level log line to the block in case unknown nodes are used
as we do for other blocks already.

Closes: #2085

See: #2342

This can be trigged by:
* overly long username,
* overly long password,
* overly long user agent string,
* overly long path.

Closes: #2342

Marvin Scholz authored 6 years ago and Philipp Schafft committed 6 years ago

Found with lgtm.com

This reverts commit fd2556b4.

See libxml2's 4472c3a5a5b516aaf59b89be602fbce52756c3e9.