kafka consumer/producer kwarg filtering for odo backend

[nz87]

Not sure about the location of the code, but I couldn't find a better place for it. Also I had to add some unit tests in the same file with system tests (this forced me to add an init.py also).

How Has This Been Tested?

Unit tests included and gave it a test run w/ the crawler.

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

  Checklist:

• [ ] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have read the CONTRIBUTING document.
• [x] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[kszucs]

http://stackoverflow.com/questions/3517892/python-list-function-argument-names

[kszucs]

The decorators are not necessary! :)

[nz87]

They are almost never necessary, but I tought they'd mark the purpose (and result) of the functions better than the function names themselves and I wouldn't wanted to include any kind of cleanup logic in the function body.