PDI-11376 - Unit test, refactoring, cleanup
PDI-11376 - Calculator Step Get Only Digits fails on Nulls with Data Type issue
[PDI-11926] Create repo connection for each remote job

If a job run via /kettle/runJob exceeds HTTP timeout, repository connection may be invalidated.
This fix creates a dedicated repo connection for each job using SlaveServerConfig.

http://jira.pentaho.com/browse/PDI-11926
[PDI-11926][TEST] Test refactor of JobExec Conf

Test behavior of JobExecConf with repository connection info
Merge pull request #509 from hudak/pdi-11926

[PDI-11926] Fix /runJob Servlet, exception thrown when job exceeds HTTP timeout
Merge pull request #455 from pavel-sakun/PDI-11376
PDI-10762 - Trans and TransMeta leak

1) For empty constructors for Trans and TransMeta classes assign
LogChannel.GENERAL chanel by default.
2) junits to check LogChanel.GENERAL added
3) LoggingRegistry now thread-safe singlton class
4) added junit test to test that LoggingRegistry is statically initialized
Merge pull request #487 from prakapenka/PDI-10762

PDI-10762 - Trans and TransMeta leak