Elliptics logs and configs paths were changed.

They are located in **elliptics_dir** directory. It will simplify working with
elliptics logs and configs.
collecting logs playbook was updated:

* `fetch` module usage was fixed
(after fetching logs we were trying to iterate through files (to zip them) when
there were only directories)
* logs directories were parameterized
(we can change them in one place now)
elliptics config was extended with new parameters
fix: compatibility tests were updated for new logs and configs paths
unnecessary files were removed
Merge pull request #62 from 'features/extend-elli-conf'

preparetion for real cluster tests