tests: add support for SSH server variant specific transfer paths

OpenSSH for Windows requires paths in the format of /C:/
instead of the pseudo-POSIX paths /cygdrive/c/ or just /c/

tests: add support for SSH server variant specific transfer paths

OpenSSH for Windows requires paths in the format of /C:/
instead of the pseudo-POSIX paths /cygdrive/c/ or just /c/

Reviewed-by: Daniel Stenberg
Closes #5298

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tests: add %NOLISTENPORT and use it

The purpose with this variable is to provide a port number that is
reasonably likely to not have a listener on the local host so that tests
can tr

tests: add %NOLISTENPORT and use it

The purpose with this variable is to provide a port number that is
reasonably likely to not have a listener on the local host so that tests
can try connect failures against it. It uses port 47 - "reserved"
according to IANA.

Updated six tests to use it instead of the previous different ports.

Assisted-by: Emil Engler
Closes #5270

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runtests: always put test number in servercmd file

tests/FILEFORMAT: converted to markdown and extended

Closes #5261