Cleanup. Adding PlainDir format for HdfsTarget
* Avoid double logging when running several interfaces
* Don't send error emails during in unit tests

Change-Id: Id12dd4b77bed111f8c0dd3f4f1519ff00f731924
Reviewed-on: https://gerrit.spotify.net/gerrit/36456
TC-Compile-And-Test: Team City <teamcity@spotify.com>
Reviewed-by: Anders Nyman <nyman@spotify.com>
Reviewed-by: Erik Bernhardsson <erikbern@spotify.com>
Reviewed-by: Elias Freider <freider@spotify.com>
improved write access functionality to work as intended with newer versions of Hadoop

Change-Id: Iaa94963d3eef1f6ee37ab6f77757c18843ba12c0
Reviewed-on: https://gerrit.spotify.net/gerrit/36944
TC-Compile-And-Test: Team City <teamcity@spotify.com>
Reviewed-by: Elias Freider <freider@spotify.com>
Added method for adding config overrides

Change-Id: I98ebad8f962e6e0eb59fe2fb17c2cc88c15994f8
Reviewed-on: https://gerrit.spotify.net/gerrit/36770
TC-Compile-And-Test: Team City <teamcity@spotify.com>
Reviewed-by: Elias Freider <freider@spotify.com>
Reviewed-by: Anders Nyman <nyman@spotify.com>