curl: improved IPFS and IPNS URL support

Previously just ipfs://<cid> and ipns://<cid> was supported, which is
too strict for some usecases.

This patch allows paths and query ar

curl: improved IPFS and IPNS URL support

Previously just ipfs://<cid> and ipns://<cid> was supported, which is
too strict for some usecases.

This patch allows paths and query arguments to be used too.
Making this work according to normal http semantics:

ipfs://<cid>/foo/bar?key=val
ipns://<cid>/foo/bar?key=val

The gateway url support is changed.
It now only supports gateways in the form of:

http://<gateway>/foo/bar
http://<gateway>

Query arguments here are explicitly not allowed and trigger an intended
malformed url error.

There also was a crash when IPFS_PATH was set with a non trailing
forward slash. This has been fixed.

Lastly, a load of test cases have been added to verify the above.

Reported-by: Steven Allen
Fixes #12148
Closes #12152

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tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so

tests: remove leading spaces from some tags

The threee tags `<name>`, `</name>` and `<command>` were frequently used
with a leading space that this removes. The reason this habbit is so
widespread in testcases is probably that they have been copy and pasted.

Hence, fixing them all now might curb this practice from now on.

Closes #12028

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tests: fix log directory path in IPFS tests

Hard-coding the log directory name fails with parallel tests.

Follow-up to 65b563a96

Ref: #8805

curl: add support for the IPFS protocols:

- ipfs://<cid>
- ipns://<cid>

This allows you tu use ipfs in curl like:
curl ipfs://<cid>
and
curl ipns://<cid>

Fo

curl: add support for the IPFS protocols:

- ipfs://<cid>
- ipns://<cid>

This allows you tu use ipfs in curl like:
curl ipfs://<cid>
and
curl ipns://<cid>

For more information consult the readme at:
https://curl.se/docs/ipfs.html

Closes #8805

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