HPCC-9494 Clean up unused roxiemanager code

Unused component, whcih would likely not work any more because of Roxie
changes.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #4498 from richardkchapman/remove-roxiemanager

HPCC-9494 Clean up unused roxiemanager code

Reviewed-by: Gavin Halliday <ghalliday@hpccsystems.com>