Change default logback config to write to stdout

Change default logback config to write to stdout

- write to stdout instead of to *.log files [1]
- do not version the .classpath in git

[1] This change only has an impact on local development (especially when run in docker containers),
since the logback.xml is [fully overwritten anyways via OOM](https://gerrit.onap.org/r/gitweb?p=oom.git;a=blob;f=kubernetes/aai/components/aai-resources/resources/config/logback.xml;h=b52318500d1327d4756bea937e79d68b79e733e8;hb=HEAD)

Issue-ID: AAI-3671
Change-Id: Ifb4b7b60a2bf7aa22210210fdbcbc05044c59e8b
Signed-off-by: Fiete Ostkamp <Fiete.Ostkamp@telekom.de>