tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

tests: add `cookies` features

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

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

tests: fix tag syntax errors in test files

test44[2-4]: add '--resolve' to the keywords

... so the tests can be automatically skipped when
using an external proxy like Privoxy.

Closes #9250

test444: test many received Set-Cookie:

The amount of sent cookies in the test is limited to 80 because hyper
has its own strict limits in how many headers it allows to be received
w

test444: test many received Set-Cookie:

The amount of sent cookies in the test is limited to 80 because hyper
has its own strict limits in how many headers it allows to be received
which triggers at some point beyond this number.

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