Add native logging from spring boot to logstash

[cloudowski]

Use logstash-logback-encoder for docker and maybe even for dev profile. This way we would have better logs with parsed fields.

[cloudowski]

It's not that easy - logback-encoder uses... logback and it requires logback-classic which conflicts with log4j (slf4j to be more specific). Thus it needs deep redesign which must be postponed at the moment.