HPCC-12447 Regression suite error message poor

Add checkHpccStatus() function to determine the status (installed/run)

Add new errors to Error exception class

Add HPCC System status checking at the beginning of ecl-test

Signed-off-by: Attila Vamos <attila.vamos@gmail.com>
Merge pull request #6569 from AttilaVamos/HPCC-12447-fix

HPCC-12447 Regression suite error message poor

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>