PDI-11247

Added exception type for halting job steps with blocking operations.
Merge pull request #286 from hudak/PDI-11247

PDI-11247
PDI-10166 KettleEnvironmentTest is failing
Merge pull request #291 from stepanovdg/PDI-10166

PDI-10166 KettleEnvironmentTest is failing
PDI-11427: Fixed PluginRegistryTest to not count on test execution order