Fix bug in Java UDFs with non-Docker-DB Exasol Instances
The release 20190726 of the script-languages introduced a bug for Java UDF. This release provides a fix for the bug. As a safety precaution, we added the ability to run the tests against external Exasol Instances which allows the tests to run against other non-Docker-DB Exasol Instances.
Minor changes:
- Used Bazel version for compiling the UDFClient is pinned to a fixed version
- Using the same executable name for the UDFClient in release and test container
- Support for multiple Docker-DB Version for testing
- Improve the Exaslct BaseTask to simplify the extension of Exaslct