tests: use '-4' where needed

Our test servers run either on ipv4 *or* on ipv6, as requested.
A test case using 'localhost' or '*.local' in the url needs to
run with the specific vers

tests: use '-4' where needed

Our test servers run either on ipv4 *or* on ipv6, as requested.
A test case using 'localhost' or '*.local' in the url needs to
run with the specific version of the server started.

Otherwise, curl's "happy eyeball"ing will connect to another
server that may be running due to parallel testing or for some
other reasons.

Note that port reuse here depends on the OS strategy and it
seems netbsd is especially likely to hit this.

Closes #15060

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tests: make precheck for HTTP on 127.0.0.1 into a feature

It can now be required easily in <features> instead of having perl code
in a <precheck>.

Closes #15039

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: add `cookies` features

These tests don't work with `--disable-cookies`.

Closes https://github.com/curl/curl/pull/10713

http: consider cookies over localhost to be secure

Updated test31.
Added test 392 to verify secure cookies used for http://localhost

Reviewed-by: Daniel Gustafsson
Fixes #67

http: consider cookies over localhost to be secure

Updated test31.
Added test 392 to verify secure cookies used for http://localhost

Reviewed-by: Daniel Gustafsson
Fixes #6733
Closes #7263

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