HPCC-11958 Add Roxie State check to preflight

The similar logic in ecl-roxie is used by this fix to
retrieve and format information about roxie state (hash).
The information is displayed inside ECLwatch preflight
page (a new column 'Roxie State'). WsMachine thread pool
is used to improve the performance of retrieving the
information.

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
HPCC-11958 Remove the context from CRoxie...Param class

And also remove the context from getRoxieStateInfo().

Signed-off-by: wangkx <kevin.wang@lexisnexis.com>
Merge pull request #6326 from wangkx/h11958m

HPCC-11958 Add Roxie State check to preflight

Reviewed-By: Anthony Fishbeck <anthony.fishbeck@lexisnexis.com>
Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>