HPCC-12320 Modify listmachines in configgen main.cpp to only produce nodes with hpcc components

Signed-off-by: Michael Jon Gardner <Michael.Gardner@lexisnexis.com>
Merge pull request #6526 from Michael-Gardner/HPCC-12320

HPCC-12320 Modified configgen -machines to only produce nodes with hpcc components

Reviewed-By: Gleb Aronsky <gleb.aronsky@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>