tests: use %LOGDIR to refer to the log directory

This will allow it be set dynamically.

Ref: #10818

test399: switch it to use a config file instead

... as using a 65535 bytes host name in a URL does not fit on the
command line on some systems - like Windows.

Reported-by: Marce

test399: switch it to use a config file instead

... as using a 65535 bytes host name in a URL does not fit on the
command line on some systems - like Windows.

Reported-by: Marcel Raad
Fixes #9321
Closes #9322

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test399: verify check of too long host name