HPCC-10820 Roxiemem calls checkabort too often

Make check frequency dependent on timeout.

Signed-off-by: Richard Chapman <rchapman@hpccsystems.com>
Merge pull request #5376 from richardkchapman/roxie-timeout-trequency

HPCC-10820 Roxiemem calls checkabort too often

Reviewed-By: Mark Kelly <mark.kelly@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>