[AAI] 15.0.3 release

[AAI] 15.0.3 release

- [graphadmin] make auth configurable
- [resources, traversal] cleanup logback config by removing logToFile option [0]
- [resources, traversal] reduce log noise from liveness probe
- [babel] make tracing configurable via globals

[0] this is not a viable option anymore in a readonly filesystem. EmptyDir volumes can
    still allow logging to file, but sooner or later these volumes fill up

Issue-ID: AAI-4124
Change-Id: I3a8284e3cd8a3b387722fa49506cfdeaeeb303f0
Signed-off-by: Fiete Ostkamp <Fiete.Ostkamp@telekom.de>