tests: add -q as first option when invoking curl for tests

To reduce the risk that the user running the tests has a .curlrc present
that messes things up.

Support 'option="no-q"

tests: add -q as first option when invoking curl for tests

To reduce the risk that the user running the tests has a .curlrc present
that messes things up.

Support 'option="no-q"' for the <command> tag to switch it off on demand.
Use this new feature in test 433 and 436.

Ref: #13284
Closes #13387

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tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

tool_findfile: check ~/.config/curlrc too

... after the initial checks for .curlrc and if XDG_CONFIG_HOME is not
set, use $HOME and $CURL_HOME to check if ~/.config/curlrc is present.

tool_findfile: check ~/.config/curlrc too

... after the initial checks for .curlrc and if XDG_CONFIG_HOME is not
set, use $HOME and $CURL_HOME to check if ~/.config/curlrc is present.

Add test 436 to verify

Reported-by: Sandro Jaeckel
Fixes #8208
Closes #8213

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