[PDI-6923] The generated YAML file for Greenplum Loader is not correct i...

...f database schema is specified
* Changed: unquoting schema in yaml file (yaml scanner requirments)
* Changed: reformat sources
+ Added: integration test case for this issue 
* Changed: test class moved to the project test folder (integration) and added to AllRegressionsTests.java
* Changed: corrected tests for also successful running at developers machines(root in windows case, user.dir for ui icon).