HPCC-10142 queryLogicalFilename not supported on hthor

In Hthor
    Fix multi part logical file processing for both subfiles belong to a
    superfile and single logical file

In Regression Suite
    Add deistributed file generation into thor setup
    Add thor specific setup key file
    Add platform specific keyfiles for issue10142.ecl

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
(Actually, you may not be processing them all, just looking for ONE that you can read - in which case that is ok)