HPCC-12133 Change log level for Roxie failed to open file

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #6391 from richardkchapman/roxie-trace-file

HPCC-12133 Change log level for Roxie failed to open file

Reviewed-By: Jake Smith <jake.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>