HPCC-8934 Add support for huge pages to roxiemem

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
HPCC-8934 Minor changes following code review

Also use the setting of defaultMemoryLimitMB from the aganet topology

Signed-off-by: Gavin Halliday <gavin.halliday@lexisnexis.com>
Merge pull request #4090 from ghalliday/hugepage

HPCC-8934 Add support for huge pages to roxiemem

Reviewed-By: Jake Smith <jake.smith@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>