HPCC-11338 Use control:alive for Roxie check

Signed-off-by: Gleb Aronsky <gleb.aronsky@lexisnexis.com>
Merge pull request #3 from garonsky/HPCC-11338_use_control_alive

HPCC-11338 Use control:alive for Roxie check

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>