Added tetrapak config.ini
[lager_journald_backend] Tetrapak/config.ini, ejournald dependency

Summary:
* Added ejournald dependency in README
* Added ejournald dependency in README

Test Plan: Read

Reviewers: hwinkel, skattelmann, hsychla

CC: druss, aschultz

Differential Revision: https://review.tpip.net/D1046